Btw, following the "doesn't feel like the real deal", "only a real amp/cab experience is acceptable" (add a bit of amp-in-the-room flavour to it...) and what not discussion throughout the last pages, I feel like an outlier.
In all seriousness, if anything, the greatest aspect of modeling for me as a live player (at least once modeling had crossed a certain "quality threshold", which IMO it has) is that I *don't* have to deal with all that archaic, inconsistent mess anymore. Which is especially true for cabs. If I wasn't using modeling for my core tones but wanted to keep using whatever real amps, I'm sure that by now I'd run them through a load box and then into whatever FR system.
The differences in projection of one and the same cab under different conditions has been driving me bonkers as long as I can think of. I own (or owned, some are still there) some great sounding cabs and while they were fantastic at times, *all* of them sucked so much ass at other times, it's simply been maddening. Even my 70s Orange 4x12 (/w well worn in old Greenbacks), possibly the best cab for my taste I've ever played through, has been a victim of that more than just once (let alone the handling aspects).
I really did everything to adress these issues. Got a Deeflexx, came up with a modified variation myself, installed "speaker donuts", whatever. And as far as the FOH signal goes, I always brought my own mic, mounted with a mic clamp straight on the cabs, the position carefully measured.
In the end, it was all working fine, sometimes great - just that more often than what I found acceptable, it wasn't.
Add to all this that with FR solutions, I can have the same sound (minus the dreaded Fletcher Munson thing...) while practising at home, playing on small vs. large stages, playing with IEMs vs. monitors, etc. Especially being able to have my live sound at appartment volumes is possibly worth more than anything else.
In a nutshell: Someone would basically have to point a gun to my head to make me use a real cab ever again (unless the situation dictates it, such as on sessions or rental backline gigs).