This program is a client for the very solid Tvheadend TV streaming server. Tvheadend supports pretty much any source you can think of, but is a little more complicated to setup.

Tvheadend is a selfhosted service meant to be run on your own server with your own TV dongles / IPTV channels / etc.

If you only want to watch TV on your PC, doing so with something like Kodi is probably a better idea, as Kodi also supports USB tuners and is simpler to setup (doesn’t require a separate server).

I really like Pop!_OS, AFAIK it doesn’t have any telemetry. It’s basically a Ubuntu fork but without the stupid Ubuntu stuff, and they’re currently even working on their own Desktop Environment.

That’s incorrect, Graphene OS has Android Auto support.

If you’re ok with using your tablet as a drawing tablet with your PC, I use an app called Virtual Tablet for that. Sadly it appears to be Windows and MacOS only, but a quick search led to Weylus. I have no idea how well this works and never tried it, but from the readme it sounds pretty good.

Miracast is pretty good, but I don’t think it supports DRM-content. Also it seems to be getting phased out in favor of chromecast.