It would be great.
I'm currently subscribed to Game Pass, testing my first 1$ month, and... it's really not perfect.
It's cool to have access to many games like this, but a lot of the games are in different / inferior versions than the "normal" versions on Steam / Gog etc.
We tried Wolfenstein Youngblood with a friend to try it in Coop, and the game doesn't offer any fullscreen option, it's only windowed / borderless, I was scared when I saw this in the options, and I was right, it's a stuttery mess that feels like 35 fps even when you can hold a steady 60, and there was nothing I could do to try improving it since the game pass games are UWP apps that are completely locked.
Another thing, more personal this time, but I also tried We Happy Few, for about 2 hours, and I liked it so much that I felt bad playing it on Game Pass and not Steam, because when I like a game, I prefer having my stats and all on Steam, so in the end I ended up buying it on Steam...
My experience with Game Pass was more like, broken version of games, or testing games and see if I want to buy them lol