Jazz Fusion or Jazz Prog Fusion

I've tried to articulate this before, perhaps unsuccessfully, so I'll try it again.

For those of us who were listening to prog in the late-60's/early-70's, it was virtually a natural progression that we would start listening to fusion (RTF, WR, Miles, HH), because just at the time that traditional progressive-rock was stagnating, fusion was growing its wings; and, lo, it had many of the same characteristics that we loved in progressive rock:  complex songs and way-competent musicianship, opening our minds to really endless new possibilities.  I remember seeing Mahavishnu O opening for ELP 'round about '72, if you get my drift. 

I can't tell you much about the people who frequent this site, but I can tell you that if they found their way here at all it is because they are inclined to like  'challenging' music, which I would think would include fusion and even traditional jazz.  (Jeez, I stumbled upon the site looking for a Rush review (hardly my definition of a 'pure' prog band)).  Hence there is a fusion category here.  I agree it is disorienting to see Kind of Blue there as the most popular album, but that will eventually fade and we'll see We Want Miles up there.

History sez that during the time frame in question there was cross-pollination that made categorization next to impossible.  I understand the impulse to keep the site 'pure', but history tells us that music is an inveterate and lecherous cross-breeder (who woulda thunk that Robert Johnson would beget Led Zep).