I guess I'm alone on this one, doesn't seem like a big deal to me. We play some pretty big gigs and some pretty popular clubs. We have NEVER been accused of looking unprofessional. Actually quite the opposite. I'm not offended though to each his own.
I will say however that airheads comment about someone stating that wrong notes are ok and our main job is to smile is way off base. I also didn't realize that we qualified wrong notes to be in the key or not? Never heard that one before.
That all being said a 250 song play list makes it pretty darn hard to memorize every set of changes, at least for me! Also consider multiple subs on any given occassion.
Well said....