The with hiding the games is I’m a gamer and a developer, but not at the same time. They could split it into two launchers and have a “hey make the next fortnite!” tab that links to a new launcher download. Either way it’s ghastly how slow it is and that’s not going to encourage anyone to get into it.
Just one engine installed currently, I keep it pretty clean. It hasn’t helped, it’s just not very well optimised for large numbers of assets and projects.