Back then, there were iBooks (entry-level) and PowerBooks (professional, high performance and expensive). There had been PowerBooks since way back in 1991, well before any ebook reader. I am not sure what your gripe is.
> Or the iPhone 9? That didn’t exist.
There’s a hole in the series. In what way is it a problem, and how on earth is it similar to the situation described in the parent?
> Or MacOS? Versioning got a bit weird after 10.9, due the X thing.
It never got weird. After 10.9.5 came 10.10.0. Version numbers are not decimals.
Seriously, do you have a point apart from "Apple bad"?