Call me old, but I don’t like it all. This seems over the top
I just wish developers would make mobile UIs consistent with the OS. The Apollo Reddit client and, surprisingly, the official GitHub app are the only third-party apps that I have that feel/look like "native" iOS apps.
When it's not over-the-top animations, giant UI elements, tutorial modals, or fullscreen pop-ups, it's small details like the (IMO ugly) custom font and the sharp-cornered buttons in the Dropbox app. At least for that particular app, I can just use the built-in Files app, but no such luck for other apps.
Tasteful uses of libraries like this can add a fair bit of “fun” and friendliness to an app, and younger generations do dig them from my user testing at least. Depends on the app and use case I think.