Where did you get that from?
Seems like a fairly straightforward extrapolation...and/or deduction...whichever.
The OP wants more options in their "builds," more "crunch," and more feats (even though they are optional).
Someone said, "So, like, more classes akin to Warriors with battlemaster maneuvers?"
The op said, "no, not like that."
Someone said, "So, like, Warlocks with multiple choice points for their creations?" And/or "adding things like Invocations" to other/all classes?
The op said, "no, not like that."
Someone said, "So, like, 4e Essentials except in the direction of more complicated than simplified?"
And while the op seems to have said, "no, not like that," it does sound like "more complicated" rather than simplified
is what is sought...with more feats and more options and more "stuff" than just a subclass...more "depth" vs. "breadth," I believe it was described.
So...sounds to me, like what is being dreamt up is taking 5e, giving a whole bunch of "optional subsystem add-ons" turning it back into 3.5/PF, and slapping a "New 5e Supplement" label on it.