For me it's been super stable.
I've hardly seen any bugs. And in those remote cases, it would be more correct to call them quirks than bugs, which have later been fixed anyway.
I've been using for intensive gaming, AI projects, and audio production. And when I say audio production I don't say Audacity. I say recent versions of Ableton Live running on ASIO drivers with windows VSTs and Max 4 Live instruments at 5 ms latency, all of this running through Wine with an amazing Wine managing software called Bottle (hehe).
As for gaming,, it's not hard to see people claming they get even more fps than they get with windows.
It's not a PopOS thing, it's the Linux ecosystem that is finally getting mature enough to pull this out (this time for real).
On top of this, System74, the company behind PopOS who is selling laptops with that OS, are also optimizing the kernel to make sure everything runs super smoothly...
I really don't see where your "buggy as hell" is coming from.
we don't need an FOSS self-hosted alternative to X.
We need a FOSS alternative to the cloud/hosted model such that there's distinction between the two, everything is everywhere for everyone, free.
Fediverse, but better. But we're not even at Fediverse ;)