I used to use MythTV back in the analog TV days. It's much easier to use when you have proper cable channels. I couldn't be bothered to pay >$140/mo for Cable TV any longer.
So now I just pay $60 for internet, and pirate everything I wanna watch with Sonarr/Radarr/Jellyfin/Jackett/Qbittorrent and a $2/mo VPN from Windscribe.
Honestly, with YouTube experimenting with 'inline' commercials, I think MythTV is going to make a comeback; because the big thing MythTV had going for it, was detecting commercials and removing them from the recordings.