I'm assuming the big name products here have carefully measured, A/B tested, etc. every screen and they are at their best (other than Apple Music, which is a whole other creature). That said, product teams should still periodically audit onboarding content, ideally with a set of fresh eyes. Does everything still make sense? Is there a logical flow from A to B?

It would have been interesting to be "a fly on the wall" and see how some of these evolved over time. I suspect some of the oddities initially started with a good set of screens, but then a new piece was later tacked on without a full audit or without the resources to change everything else.