Considering that they were shipping 18,000 classes in their iOS app back in 2015, a quarter the size of their 2019 app has to be still unreasonably massive.
Size, not necessarily, but yes it was in the case (the person was looking at why the binary itself, not any of the assets was above 100 meg).
> or complexity of an app
I'm not sure how 18,000 classes isn't a guaranteed extremely complex app.