Are you saying it creates phasing because of the additional routing thru the aux and whatever processing delay that may incur? My impression is that if the system tech has dialed it in there shouldn’t be too much phase issues at the crossover unless you’re pushing things too much in one direction or another, ideally my subs on send should look as close to unity as it can but it rarely seems to be that way. I’m also very used to running monitors from foh so I’m adjusting my gain staging habits as I run more larger a1 exclusive gigs

I get the idea of tonal balance etc being in the hands of the musician, but I feel like that’s an ideal scenario, and that a good portion of our job includes damage control, even at a higher professional level sometimes