Completely agree. I haven't used NPM since I started self hosting a few years ago, but I was never able to get it to work right. I ended up using apache2 as it was pretty well documented everywhere. Moved to caddy v1 when I found it as the config is so easy to write and understand. Moved to v2 when it was released and had no issues. Their forum is incredibly helpful if you run into any issues. At this point its a "relatively" mature platform and most projects I've setup have an example config (usually just 1 or 2 lines because that's all you need).
I've used it a bit, mostly for merging/splitting some pdf files. Haven't delved much into the advanced features. Its been flawless for those tasks. It was also super simple to setup.
Do you self host your email or use it with an email provider? Also, does it need its own inbox/address to function? I can't really tell from the documentation if it functions along side normal emails or if it'll mess up your inbox if you use it with your normal inbox/address.