This 100%. I am currently trying to learn as much as I can from a close friend who is a pro live sound engineer (5000+ audiences he also is an event producer sometimes too) and owns a backline business too. A friend of mine who plays lead in our band came with me to his industrial unit to learn how to set up our amps and he gave us such good info on how to set up individually and how to integrate with each other.
Basically it matters not much on how you sound individually but how your sound integrates with other band members. He told us loads of examples where he gets overlapping frequencies being played and in order to get an overall good mix he has sometimes just had to turn some stuff down so it’s inaudible eg a synth being played with a lot of left hand plus a bass and a piano left hand. He also said never turn anything down, as he can cut stuff but as others have said you can’t make sounds from nothing. He said bassists are sometimes the worst as they cut all the treble and some high mids out and all he gets is a muddy mess of a sound.
Basically if your engineer is good then ask what they want and give it to them, and make sure your band plays in a way that leaves space for each other.