Thanks, Edwin. Experienced FOH engineers trust the musicians to build the sound of their band - that's who the band is, and who the musicians are, after all. With a good band with good players, the engineers should not get involved with any changes to what they are getting from the stage to put in FOH unless there is an issue with the venue acoustics that requires corrective actions.
I'm glad you've had enough regional and national touring opportunities to get to work often with these experienced, confident guys. We know how things tend to be at the local level. The less experienced, less trained FOH engineers want to place their own imprint on the mix, to make it sound like they think the band should sound, vs letting the band create their own sound.
Of course, this works best with the better bands, where the players really do know what sounds best on their instrument to build the sound of the band.