I have a big beefy gaming PC. I still use cloud gaming from time to time. It means I don't need to juggle so many 100GB installs on my gaming handheld or cheap personal laptop, both of which can sometimes struggle to play actually demanding games. Battery life on those mobile computers are significantly better when cloud streaming a game instead of running computationally demanding games locally. It also makes the friction around trying out a game significantly lower, all I need to do is click play and the game is running instead of having to wait for it to download, play it a bit, decide I don't really like the game, and then uninstall it.

The feature being bundled in with GamePass makes it worth it. I used to VPN home and try and run games remotely, but it was honestly a bit of a pain. Just pressing a button and having the game launch is quite nice.