1.Yes, I agree running a stereo rig Live doesn't really make a big difference.
2.BUT I think there is nothing wrong with doing so, if you wish to 'go stereo'
Many sound techs will either refuse, or agressively question you when you ask for L+R inputs, no doubt thinking you are a noob, or an idiot. (in the same way as when you tell them you have an Axe-Fx and are going direct )
3. I know many guys in bands local to me, and AFAIK, NONE of them are running a stereo rig, making me the only one
I still refuse to alter my setup, just to join them.
4. Most of my patches are set up in stereo, and when I tried (Yes I did try to go) L+R Sum, something wierd happened to most of them. Levels differed, and some of them sounded 'squashed' somehow. I'm no expert, but I know I didn't like it.
So, although I say all of that as a way of qualifying why I choose a stereo setup in a live situation, I 100% beiieve it does not make me a bad person
Please don't hate me