Age verification, yes. The game launchers, I'm not quite sure yet because I don't have any games installed that have them, but I'm going to presume not. And while I'm aware GameEx has Steam integration, this will allow people with any front end to have the same functionality. Plus I can always get it working with non-steam games as well (not just Origin or Uplay but GOG or even just abandonware people 'find' on their hard drives).
The big thing is the scraping of media. Even if someone doesn't want to integrate the shim, they can use it to get media and that's a big deal, imo. I'm not sure if I'd have gotten far with Hyperspin (and now with GameEx) without EmuMovies.