This is an interesting perspective and one I think has a lot of truth to it. Where it breaks down is that there doesn't seem to be an equivalent transition from "4.5" to 5E. Essentials to some degree, but not really. Maybe this is where 5E represents a kind of "return to roots," a full cycle complete and, seemingly, the best of the last cycle incorporated in a new octave. a
Someone - unfortunately I can't remember who - had an interesting post sometime in the past couple of months arguing that 5e's class design is very closely related to Essentials. It seemed plausible.5e certainly does not fit.