.A person running FOH that doesn't get out of the booth to walk the room is, at best, a complete novice at it. If they've been doing FOH for a while, and don't do that, then they're incompetent. That is a very basic part of doing sound.
THIS! I’d do that religiously even at my regular club gig. FOH ends up on non prime real estate lotsa times. Even well placed, what you hear is only accurate for that spot