This is good in theory. In practice, the gameplay catalogue is cluttered with too many game. This make it difficult to find great titles.Xbox series is a great device for people to catch up on last decade of games in a better form than what was before. I can clearly see where xbox excels (rdr1 only 4k in xbox but not on PS, xbox exclusive old titles).
Nintendo games are more expensive. However you can almost blindly buy any Mario or Zelda game and it will put a smile on your face. Steam has lots of fab games including cute and fun indie or kawaii games. Most of these are not available on the Xbox store.
This is why handhelds by Lenovo with a steam button could be best of both world. Xbox and steam stores on the same device but with dedicated buttons for each launcher.