I don't think "killer musicians" should "look down" on anyone else for what instrument they use and/or how they play, but I suppose if they are narrow-minded enough, it can happen.

Conversely, arranger players should not look down on those incapable of gigging with an arranger just because they can't play one as well they'd like, or it doesn't seem to fit their personal idea of what makes a legitimate instrument.

Generally, critics of either method of gigging (with or without an arranger) are like eunuchs...they know how it's done, they see how it's done, but they can't do it themselves.

Ian