Interesting points here.

Just a few summers ago I worked with an oldies R&R showband that had live drums, bass, two guitars and three vocalists. My arranger provided piano, organ, sax, trumpets and strings. But, never rhythm or bass. The accomp button didn't go on until I resumed my single committments in the fall.

Augmenting live players with auto accomp would have been an insult to them and an almost guaranteed train wreck timing-wise.

Eddie