I've gone into Stadia Pro for a while, with a little tv Linux machine. It turns out that with fiber and a fast processor that I can only do the new 1440 resolution. You need a bunch of flags with Chrome it use hardware video acceleration. When you use 4K, it pixelates a bit in fast motion and then settles down when you are still. I can't tell the difference between 4K and 1440, and that's probably because of the games.
We old men like Submerged because it is like travelling. I can finally get my thumbs to do two different things. I suspect that hard-core gamers will never be happy with this whole arrangement. For us seniors, it keeps the neurons firing.