Hiya Gregorio,
I appreciate your perspective on this. FWIW; When I noted that the OP fordgtlover commented... "I was unable to find any real consensus on the breakdown of the frequency range into bass, mids and highs (and the divisions within those ranges). If anyone has an authoratative view on this, I'd love to hear it."
I recalled seeing this info in print somewhere and thought I'd contribute to the thread, giving proper credit to its source.
Being a devoted reader of "The Absolute Sound" magazine for many years (about 1980-2001), I personally consider Harry Pearson as authoritative a source as can be found. His "breakdown" seems more specific, and yours somewhat general. However no one's infallible, and I sincerely do appreciate your perspective (as said earlier).
Best,