GamePass is a service for mildly entertaining games (around 7/10 score). The better ones leave the service Netflix style all the time and for the games I’ve checked DLC was not included, so purchasing needed.
Destiny 2 fell down to mixed reception in recent months according to Steam. Most Sony PC games launch Steam Deck verified these days. Same for many other games. Since SteamOS is a Linux distribution, compatibility extends to other mainstream distributions.