Mistwell
Crusty Old Meatwad
It's the most important comment. Distilling all classes down to three or even a single really bland core class is not D&D.
OD&D was three classes.
AD&D and BECMI was four. 2e was, mostly, as well.
4e was four "types" instead of four classes.
I'd say a majority of D&D versions used this concept of distilling all classes down to three or four classifications, and then spread out variants from there.
Why would a Psion need a different hit point, ability/feat, number of spell/psionic per level, and attack bonus than a mage or a sorcerer (I think armor will be listed for each sub-class btw, just like it was done for Cleric/Druid in earlier editions)? Similarly, why would a Paladin need a different progression on those factors from a fighter? Sub-classes worked just fine in older editions of D&D in this same manner.
I really think you're getting too caught up in titles, and assuming way to much about how things will function, all from a short tweet. You can have massive variation in how each sub-class operates, despite the primary class title. It's mostly a "how do we organize the book, balance things, and use a bit of short-hand to save space" type thing.
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