One thing I never understood is why it is called "5G" (and not just LTE++)? All the previous "Generations" were pretty big technological leaps in the physical l

One thing I never understood is why it is called "5G" (and not just LTE++)? All the previous "Generations" were pretty big technological leaps in the physical layer, each G was a completely different beast using a completely different physical layer, but from what I gather, "5G" is just LTE with some added frequency bands, bigger QAM, more MIMO, etc (just like LTE to LTE+ added, nothing generational). So, just "before we used to divide this thing into 64 parts and now we divide into 256 so we have 4x the bandwith", nothing that couldn't be done into LTE++ (or LTE+2, or whatever). The only breaking change seem to be the change in the orthogonality of the up-link channel modulation (down-link remains unchanged). So, can anyone explain to me what is the generational difference between LTE and 5G (not simply more frequencies and tighter parameters)?