Are there any good piracy streaming apps available for Android TV that aren't incredibly involved?

Seconding Stremio! Just had to install the Torrentio add-on and even my tech-challenged mom can use it on her Android TV with no problems. I also got her a RealDebrid account (9 EUR/6 months iirc, completely optional) so she doesn't have to deal with torrent seeds etc.

+1 for this comment. I got Stremio setup yesterday based on your post and the recommended add-ons, and it was insanely simple. I was able to get it all setup on my Samsung TV in like ~15 minutes.

It seems to be not working well as of late, I'm not sure why. A good amount of the shows I watch throw back an error.