Hey, that sounds like a package manager!

My package manager certainly doesn't sync settings and save files between multiple systems. But I'd be interested in one that does!

My package manager doesn't let me stream games to my other devices

My package manager doesn't have a nice controller-support UI

My package manager doesn't let me set up controller mappings

Well, that's kinda my unstated serious point in that joking comment: Steam, in a sense, is a package manager but a much better one in many ways so asking to abandon Steam for the system-provided package manager (which may not even exist if we're talking about pre-Store Windows) is quite flippant.

It shows a huge disregard for non-technical users. Very just-use-Wireguard (tail scale) or just-ftp-rsync-your-data (Dropbox).

No, but you can download apps via a package manager for all of that. Or use steam anyway?

I'm very confused why people these days are so happy letting one big company manage their entire library and history. Did we not learn from the 2010's?

I'm sure You can opt into most of that by linking Dolphin as a non-steam game. No cloud saves but you get to launch it through a launcher as people seem to like nowadays.

Alternatively you can set that save backup up yourself with use of your favorite cloud application and symlinks.