Opening the App Store to download a bunch of apps - in general - is probably the #1 thing people are doing when they open the App Store. Of course, installing a specific app is a top use case. But I think you're just not the average user. Lots of people open the App Store frequently to just check out what's available.

~10 years ago I would do this all the time. It's fun, kind of like surfin' the net was back in the old days, but in a walled garden of applications.

It seems plausible that casual browsing and downloading remains a significant use case. Apple surely wouldn't design the App Store focusing on discovery this way otherwise. Not sure about the #1 activity hypothesis. What I'm certain about though is that the App Store is deeply broken and they've started rushing down the path of platform "enshittification" (real thing) where online platforms become less useful, less enjoyable, or less user-friendly.

is there actually any data to back up the claim that the "#1 thing people do" is open the app store to see what's available besides your singular story about what you used to do a decade ago when all of this was much more novel in general?

I'm surprised to hear this, as I am in the same boat as the other poster. Of course it makes sense, they wouldn't build that junk if there weren't junk consumers on the market. But I still can't grasp the concept of "just installing apps".