Earlier quoted context omitted.
Apple has a practice in the last decade or so, of bumping its older products into a lower price-point alongside the newer hardware. This is a win for everyone as near as I can tell - The lower priced devices bring more people in. Apple gets to keep using existing tooling for manufacturer. Owners of these products from their initial release can reasonably expect longer support. Also, tangentially and not at all seriou…
For iPad alone there are 6 iPad versions now. And 4 Apple Pencils. It's already on Performa level. Similar things happen to iPhone (4 overlapping nearly identical models every year for a total of 7 currently being sold) and Macbooks (any number of models any given year, they are currently selling 5)
There was a model of Performa that sold for literally 2 weeks (the Performa 410). Apple sold the same series of computer under different names: The Performa 630, LC 630, and Quadra 630 are all the same machine.
I agree that Apple has a real naming problem (is this an X as in 'ex' or X as in '10'?) but I really don't find the iPad line up to be that confusing. There are 2 sizes of iPad Pro, 2 sizes of iPad Air, an iPad and an iPad mini.