So, playing in a band means dealing with people who are:
Unreliable
egotists,
drunks,
womanizers,
lazy,
too loud,
unable to keep tempo,
unable to learn new material,
too expensive,
have I missed anything?

Only the arranger keyboardist has somehow escaped/surmounted all these human faults that plague the ordinary unwashed musician.
But even they, the arranger keyboardists, aren't flawless. Nay! Their shortcoming: sanctimonious self-righteousness regarding how much better they sound than a live band; how much more professional and entertaining, the unnecessary burdens other musicians are.

I think I've about summed it up, yes? Slight hyperbole perhaps to make a point, but not so far off in premise.