No offense, but any head written over the "Feelings' changes, IF UNALTERED, is going to get gonged before the second verse!

And, if you alter the changes, it isn't 'Feelings' any more...

I guess what we have to take account of is that 'popular' music, as opposed to straight ahead jazz tunes, USED to incorporate changes that didn't have to be altered much, if at all, to provide a challenge and and interesting blow... But for quite a while now, 'popular' music has devolved to the point of utter stagnation in the chordal area.

Some of it comes from the generation of 'loop' users... Obviously, the changes are going to be as short as the loop... Most great jazz tunes, show tunes, and music from the pre-eighties had a chord structure the length of the entire verse. 32 bar loops are NOT what the kids are using (even the jazz kids!), so the whole idea of a long form solo have disappeared.

Then there was the move in jazz towards modal soloing, and modal pieces, rather than using song changes, and the combination of these two things has, I think, led to the current state we are in...