While musicians like to present themselves as highly creative people, they can be alarmingly close minded. Just like all generalized statements, that's not 100% the case: some musicians will actually care more about what you bring to the group creatively than the tools you use to get there. Those musicians are much more fun to work with.
My 6 quickly became my main, while I bring a 5 for backup. I can play longer if I'm not pumping the neck like a shotgun. Also, playing in t 3 piece, I have more room in the mix. Sometimes I get really froggy and put a capo on a 6 string! It's not a common practice, but it lets me ride a root and play chords without having an 11 inch long sixth finger surgically attached to my fretting hand.
Any musicians giving you grief over your gear aren't the kind you want to play with unless they're willing to buy you the gear they want you to play.
Basically this. I caught flack from some bands and let it bother me. Most of them never got a band together or got past the basement. Seems that "band" leaders like to create this fantasy of creating their own club since they're probably never going to hire or fire people in their day job position.