

Microsoft needs to make it so i never need to go into the steam app or the GOG app
That’s never going to happen with any store. Not Microsoft, not Steam, not Epic, not GOG. GOG games could be added anywhere, since they’re not tied to a launcher.
Either start pirating everything or “hope” one store on PC gets a real monopoly, so it’s the only one to buy from.
But for most games, I don’t think it would it be an extra burden? As an armchair developer, most games might do a DRM check online, which would have to get removed or emulated or something.
For multiplayer shooters, I don’t know if dev hosted servers are somehow a lot easier to do, compared to dedicated servers of yore, even if they’re just internal, and would get a public release when the game is EOL. Depending on how things are defined, a single player, offline mode against bots might also count and “just” the multiplayer aspect gets shut down.
Games that would have a harder time are probably MMOs or Live Service games. I don’t know how those would get sold/made, if you can never shut down the game. Maybe those types of games would basically have to be rented or something, so it’s explicitly clear you’re not getting a perpetual license.