Basically the entire multiplayer space is locked out.

Not all multiplayer games use this anti cheat techniques (and those might just be working in the near future anyway). CS:Go works perfectly, Rocket League does, Dota 2 does, LoL did at least (I don't know what they're up to these days), 7 days to die does, paradox grand strategy does, Mordhau does, Path of Exile does, and those are only sone of the games I personally can confirm.

And they're not suitable for any normal person because the UX is a dumpster fire.

People who use Photoshop professionally mostly agree, that GIMP is a great app that has just a few drawbacks compared zo photoshop. The UI was a dumpster fire, but they sorted that out. Photo Editing is on par with photoshop, at least with other free plugins. If your UX sucks, maybe it's an error on osi layer 8.

Nobody with normal tv/movie content gives you comparable quality on Linux.

I'm still running 1080p on everything and Netflix delivers 1080p to all my linux boxes. Is there a problem with 4k?

Yes, normal people do need to collaborate. And no, none of the office options on Linux are capable of functional collaboration for normal people, except Google/microsoft through browser nonsense.

Which tools on windows allow easy collaborative office projects other than microsoft or google? Well, other than cryptpad, OnlyOffice, koofr, almost every nextcloud provider, etherpad...