This has been in Apple's Human Interface Guidelines for *decades*. I believe only recently it became more open towards "onboarding", but not much further beyond "if you really must...".

Yet onboarding is the holy grail of corporate products (maybe coz it feels like powerpoint presentation of the whole product?) and the holy grail of marketing brainwashing - carefully composed sequences of known psychological tricks and manipulations to "convert" people.

P.S. I'm not sure these floating tasks lists are much better. They always feel like unnatural pressure into something you don't need to do, aka. hardsell again. I came to the product to solve my tasks, not yours.