Some (not all) of the early jazz approaches to Bacharach come off as though they were done to satisfy some A&R decision, and the artist in question begrudgingly goes along. It sounds like they treat this material as though it were lightweight pop.
What's odd about this though, and I say this as both a musician myself and a listener, is that many Bacharach tunes can be challenging in various regards. Unusual chord progressions, phrases with odd numbers of bars and jarring rhythmic shifts, wide melodic jumps, etc. Many of the tried-and-true patterns that work for improvising on pop standards -Rodgers, Kern, etc. - don't work too well with Bacharach.
What I can't figure out is why more jazz musicians didn't seem to realize this about his music. It would seem that if a jazz musician wanted something challenging to work with AND wanted to reach a broader audience, Bacharach was the ticket.
Thoughts?