Sounds like an issue with your WiFi adapter/driver. You can verify this by creating a mobile hotspot on your phone and connecting your PC to it and see if you get the same issue, if you do then it proves it's got nothing to do with your router.
Another thing you can check is your journalctl logs - run journalctl -f before launching the game, then run the game and quit it when you run into the DNS issue, and check the logs at the time the issue occurred. If there's indeed a hardware/driver issue, the errors should show up in the logs.
If it's a driver issue, there may not be much you can do about it besides reporting the bug and implementing some sort of workaround (eg using a VPN). Of course, depending on the error, there may be a fix you can apply, like turning of aspm for your chip. A better option would be to replace the WiFi chip/adapter you're using and get something that's better supported under Linux, like something with an Intel or Atheros chip. But check journalctl first and see how it goes from there.
I did! Used to have a Samsung 49" ultrawide. After using it for a couple of years, I sold it and got a 16:10 32" QHD, which I found worked better for me (+ one or two laptop screens for chat / random stuff when I'm doing serious work).
The biggest issue I had with the ultrawide is that most of the games that I played weren't optimised for it, especially in some games where things like the mini-map might be at the far end of the screen, or worse, if it was an older game then you'd have to put up with black bars, or play the game in windowed mode.
You can already run Linux apps using Termux and Termux-X11, and I'd say the performance would be better than this demo, because this is running in a virtual machine and uses it's own kernel, whereas with Termux you're running your apps directly on top of the Android Linux kernel. Also, you don't have the overhead of running ChromeOS on top of Android.
I don't play D4 anymore so I can't say if this still works, but back when I did, I used to launch it (ie the Battle.net launcher) from Steam, as a non-Steam game.
I also used the latest Proton-GE as the compatibility tool, so that's something you could try as well.
IMO you shouldn't look at it as "should I become an x user", because that sort of implies you're getting married to that distro. Instead, you should be asking, "should I use x to solve y?" For instance, I use RHEL, Debian (Raspbian), Fedora (Asahi), Fedora Atomic (Bazzite) and Arch. I also use Windows, macOS and FreeDOS. All solve different needs and problems. There's no rule saying you should only stick to one distro/OS use whatever suits your needs, hardware and environment the best. :)
Because MIUI deviates from stock Android so much that it often causes unexpected behaviour and bugs. So it's easier for developers to just say they don't support it, instead of putting up with negative reviews and complaints.
Corporates are using ThinkPads, HP EliteBooks and MacBooks. OS being Windows, macOS mainly. Linux on workstations is pretty rare - mainly used by developers - and the distro being Ububtu LTS (which I do not recommend).
Since you want to use Linux, go for a ThinkPad. There are more Linux-friendly laptops of course (like Framework and System76) but I believe none of them offer corporate-levels of stability and build-quality like ThinkPads yet - as you have experienced yourself with System76.
Main pro-tip is to avoid systems that use nVidia cards - they're often responsible for buggy suspend/resume in Linux, and can break your OS sometimes when you do an OS/kernel upgrade. So if you're after stability, avoid nVidia like the plague.
For the docking station, I've had good experiences with the HP Thunderbolt Dock G4. The initial releases were in fact a bit buggy with suspend/resume, but HP have released subsequent firmware updates to fix those issues. In fact, HP have been really good at providing regular firmware updates for those docks, and the best part is that it's on the LVFS too - which means the firmware can be updated directly in Linux using fwupd. A lot of vendors don't bother updating docking stations - and even fewer update them via LVFS, so this is something you might definitely want to look into.
Finally, for distro recommendations, I would recommend a Fedora Atomic distro since they're immutable, and rollbacks are as easy as just selecting the previous image in the boot menu. Given your requirements, I'd recommed Bluefin - specifically the Developer Experience version, since it comes with virtualisation tools OOTB.
For reference, I mainly use Bazzite (another variant of Fedora Atomic) on my pure-AMD ThinkPad Z13, and haven't had any issues with suspend/resume, external monitors, or virtualisation dev/test workflows. There's virtually no overnight battery drain either when suspending. My system also supports Opal2, so my drive is encrypted transparently to the OS, with virtually no performance overhead. It's also nice not having to muck around with LUKS and the complexities around it. I use this system for both work and personal use (gaming), and it's been a great experience so far - both software and hardware. Happy to answer any questions you may have.
This is a general tech community, mostly centered around news and end-user technology discussions, so it's very unlikely you'll get an answer here. Might want to try asking on Reddit or some dedicated Datto/Connectwise forum.
There's also XFCE and LXQt, if you want simple, easy-to-use environments.
My elderly, non-techy mum has been using XFCE over a decade across three different distros (Mint, Xubuntu, Zorin) and her experience has been consistent all these years, with no major issues or complaints. If my mum can use Linux just fine - so can anyone else (who don't have any specific/complex hw/sw requirements that is). I don't see how much further intuitive it needs to get.
KDE, Gnome, XFCE, LXQt etc all have their own place and audience. There's no need to have one experience for all - in fact, that would be a huge detriment, because you can never satisfy everyone with a one-size-fits-all approach. Take a look at Windows itself as an example - the abomination that was the Start Menu in Windows 8 (and the lack of the start button) angered so many, to the point that Microsoft had to backtrack some of those design decisions. Then there was the convoluted mess of Metro and Win32 design elements in Win 10, and finally the divisive new taskbar in Win11... you're never going to make everyone happy. And this is where Linux shines - all the different DEs and WMs offer a UX that suits a different audience or requirements. And we should continue to foster and encourage the development of these environments. Linux doesn't need to be like Windows.
I'm not sure who this Chris Titus is, but I can't believe there's no mention of Bazzite in that infographic, which is surprising because it's arguably the best distro for gaming right now (and a pretty decent newbie-friendly distro too). It's also surprising there's no mention of CachyOS, which is overall the best performing easy-to-install Linux distro right now (although since it's based on Arch, I wouldn't recommend it for newbies).
So if I were you, I wouldn't put too much faith in their video when they missed out on these two (and several other cool distros such as Bluefin, SecureBlue, AntiX etc).
In saying that, nVidia on Linux sucks in general, so I second @ulkesk's suggestion and recommend getting an AMD instead - it's so much more nicer and hassle-free, not having to deal with any proprietary driver bs, and having a smooth Wayland experience.
Well I haven't used Plasma Mobile or any of the apps you've mentioned, so it'd be nice to see what it all looks like! (and I don't have a device I can try it on either, unless I can get it working with Termux + Termux-X11?)
What @lemmyreader said, except this is XFCE installed directly on Termux (and accessed via Termux-X11, a native X server for Android). No *buntu involved here. If you have an Android as well, you can set all this up (minus the actual Chicago95 theme) using this script.