"Appropriately" is where opinions differ. I don't feel comfortable with the statement a 6-string bass makes in certain musical settings. You might.I was in a covers / party / wedding band for well over a decade, probably 1500+ gigs and not one person (in the audience) ever commented on any of the instruments anyone played. Show up appropriately dressed, play well, have fun and groove. That's all the audience cares about.
Oteil Burbridge plays a 4-string J when he tours with the Allman Brothers. I have no idea if that is his idea or theirs. It's just another data point.