Just popping in a comment about panning. I tend not to, but I’ve seen some comments encouraging it. Obviously the venue and rig play into this decision. However, I’ve seen shows where the guitarists were hard panned, and I did not get to hear one guitarist for the entire show. It was pretty disappointing, my seats weren’t that bad but I paid for the guitar solos and while watching them at a distance is one thing, hearing them would have been nice. I take this perspective into my gigs. Two of note were Pearl Jam (20k arena) and Collective Soul (2k ballroom), both guitar-heavy sounds. When I tried to correct my position for the latter, I ended up only listening to the front fill which only had lead vocal in it (and way too much 4K but I digress). I miss the magic of live shows before I knew too much. /panning-rant
Obviously judicious panning is part of being a good live mixer. I pan quite a few things, but I doubt you'd ever notice something missing in the rig if you were sitting on an extreme left or right of the pa. Things like leslie's mic'd in stereo. If you only hear one side of that, then congratulations. You got mono leslie. Verbs, stereo guitars, stereo keys (maybe not piano though), Overheads, etc.
Even with Overheads you'll hear all the cymbals pretty good even through one mic.
Things I don't pan: Voices, mono guitars, bass, just about everything else.