Two major pain points for me:
1) I can't play my whole library. During the beta I was able to play pretty much my whole steam library but that changed after GFN went live. I accept that some titles may have technical limitations but thats far from universal. Like, why can't I play Red Dead Redemption II on GFN but I can on Stadia? Pure publisher bullshit, that's why
2) I wish Nvidia made it possible to apply mods to games. Steam workshop mods work if supported but the majority of games do not support that. I don't often mod but when I do its usually to correct some 'quality of life' issue.
I ended up buying a Steamdeck to game on instead of GFN.. I hope the arbitrary restrictions holding it back disappear someday
...until I got my 3060. At a certain point it just makes more sense to buy your own card.
I've been working with Mathematica and PyTorch on it, and I played Stray, Cyberpunk and Ghost Recon all on max graphics with 120fps. It's insane and definitely moving the goalpost for me in terms of expectations.