This view can be used to discover any game in your library, regardless of import source. You can discover stuff from your MAME Fullset, Storefront Integrations, ROM imports, etc all from the view already.
You can theme in a list to do anything an auto-populate playlist can, meaning that if you wanted to add a list for showing games with achievements you could. We didn't in stock first pass because when we were creating this RetroAchievements wasn't up yet.