Just make a good interface that lets you scroll through a list of games. My steamdeck already does that

According to the creator, that's too complicated for some people:

I noticed a lot of non-technical people using ChimeraOS/SteamOS getting lost in Steam’s complex menu structure and struggling with basic things like launching and closing games.

Personally, I find it hard to believe that any meaningful amount of people could struggle with that. If they do, they'd probably also struggle to use any other gaming machine.