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I turned my streaming stick into a dumb app launcher, and that's all it should be
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
I've been using Flauncher as the replacement dash for years on all my android TVs and Chromecasts
https://gitlab.com/flauncher/flauncher
It makes a massive difference and I strongly recommend it
Would I be able to watch Plex with this? (Haven't made the switch to jellyfin yet)
Yes - it replaces the launcher (your home page, I guess you could say), but you can still download apps from the Google App Store and use them (such as Plex).
I have used FLauncher and now use Projectivity, and it is a great way to get rid of all the ads and bloat while keeping the TV fully functional.