The app store or software center on most Linux distros are bad. I think Linux developers underestimate the importance of this part of the OS. For new users, the app store is one of the big 3 aspects of an OS: launcher, settings, app store.
Gnome settings app is easy to use, but missing a lot of controls.
The app store (software center) is just not helpful for exploring apps, and updates are always problematic.
I still use Firefox as my primary web browser, both on the desktop and on mobile. But I wish Mozilla stops making stupid decisions with Firefox again and again.
Google made it invite only when people actually wanted to try it. Then when people got tired of waiting and no longer interested, Google tried to push it to everyone.