It's much simpler. You turn on the console and go to the game you want, opening it. There might be an update, but nothing close to the annoyance of using a windows PC and custom launchers (linux is slightly better in this regard, but requires a lot more fiddling to get started & compatability). There are no launchers, no multiple stores, just a single, integrated UI that works great on a big screen with a controller. There are even physical media, if one so desires, and even better, most of it works offline (after getting the day one patch with fixes and blah-blah-blah).
There are efforts to replicate that experience on a PC (mostly SteamOS) but they still have a lot of issues. I like my Deck and have used other consoles way less after getting it, but it's not for everyone. It still requires fiddling to get "all the current games" and a lot of launchers don't work when offline without some extra care [1]. Regularly launchers want the password again, which is horrible to type in with gamepad-like controls. You also need to configure the games to work properly.
I don't want to configure the game so it looks alright at 30/40/60 fps, I want it to be done already.
It's like people preferring iOS for having less options, choices and being simpler in comparison to Android, but way more extreme.
[1]: How can it be so bad? Almost nothing with a launcher works right away, especially since there are separate launcher installations per game that need to be started regularly and have their own offline-mode settings