I've got Xbox game Pass ultimate too, mainly for PC gaming, and some on Xbox. But decided to try out the android streaming when it appeared. It wasn't good. Really long buffer load times and the games I tried ran really slowly trying to keep up with the server. I'm in 76mbps so not slow.
By comparison I've played a few games streaming them on Playstation Now and they have all played flawlessly. It's the only way to run most of the PS3 and PS2 games on offer via Now. I was pleasantly surprised, especially the seamless ps3 streaming. Wish I could get my hands on that emulator!
Regarding Streaming and the original question. I was against it originally for all media. I liked to own all my music on CD and if digital ripped to mp3. That's now completely gone out the window as I have used Spotify almost exclusively for quite some time now.
Same with films. I liked to own them all on DVD and BD. But I now can't remember the last time I played one. Exclusively stream everything now, and hardly watch anything live either any more other then the news. Netflix has become the main one, alongside Disney+. With Sky providing the rest and occassionally Prime.
As for gaming. Again I was against digital copies of games. On PS3 I permed all physical copies. But for many years now on PC I've only bought digital games. Menu on Stream. And on PS4 I did start out at the beginning buying physical copies, but as someone mentioned, the disc only holds the initial install. All it did is save you having to download the initial install. So you are really using a digital download. And the negative bit is you need to insert the disc every time to play the game, whereas digital you don't.
For actual streaming gameplay I really don't do much at all. As mentioned I do a bit for Now, but that's about all. I'm not sure it will take over from digital downloads any time soon. With downloads you just wait longer if a slower connection. With streaming it downgrades the image quality and framerate if the connection speed falls. It hasn't got the same appeal as films or music.