Alright you want bollox, two reasons why jazz guitar sux:
- Physics. Guitar is acoustically less dynamic (meaning the spread between quietest and loudest possible sound) than just about any other jazz instrument, except perhaps bass. In spite of that fact, most jazz guitarists aspire to play the instrument in a manner that further limits that dynamic range and even expression, or use amplification in a manner so as to overcome that limitation. Can you imagine Coltrane never having overblown a sax? That's the way most jazz guitarists play.
- History. You could wipe guitar off the face of jazz history and it would make little difference in the development of jazz. I mean, could you imagine jazz history without drums? piano? saxophone? trumpet? even bass? Pretty tough to do. I'd put vibes, bone, and maybe even flute ahead of guitar too. It's like the 20th most important jazz instrument.
I think the problem starts with the cult of the guitar hero in rock music. A bunch of rock weenie guitarists think, hey, I can play jazz too! No you can't. You suck!
That doesn't explain Wes though. Hey, Wes, octaves was a good idea, in doses of four bars at most. After that, it's time to move on . . .
Classical guitar sucks too. A guitar concerto, that's a funny idea. Hey everybody, if we play really quietly, then maybe the audience can hear the guitarist!

All concerti suck as a rule, with some exceptions but not many. I'm pretty sure none of them are for guitar.