This is more relevant than many of us would like to admit.
I've played rock & roll dive bars in the southeast for 20+ years, almost exclusively. Occasionally we'll play a bigger venue or get to open for someone, but it's essentially the same environment on a larger scale. I always show up with a 4x12 and whatever 50-100w head suits the band. Keep the gain & feedback under control, have enough mids, & don't crank it stupidly loud.
I never really have issues with venues or sound guys, occasionally I'll have one who insists on me turning down a little lower than I'd like. In those cases, I just suck it up & deal with it. I'd say 90% of the bands I see are running a comparable setup, some of them are using 2x12's, occasionally I'll see a 1x12 or 4x10 setup. Maybe 10% of the bands I see playing out in that realm are using modelers & running direct.
There's a hundred other scenarios though, where guys are playing out just as much; church gigs, theater shows, more 'professional' corporate venues, etc. where they do things completely different. I've got buddies that play in those circles, but zero real life experience, so I honestly couldn't tell you the first thing about what people run there or how.
I've done everything from high paying original gigs, high paying/profile cover/tribute gigs, to playing the scummiest, trashiest punk rock clubs and dive bars imaginable. I understand that most people don't have that sort of wide variety of experience, so they don't have the perspective to be able to recognize how wildly different your rig needs can be based on that.
Most of the time, with the bands i'm in now, it's either cover gigs with really high quality/self provided PA, or down and dirty dive bars and clubs with my original punk band... and if I tried to run the opposite rig with the other band it would be
literally impossible.
How do I know this? I've tried before, LOL
Like I had two shows in one night in the same city, and tried to use my kemper rig that I used for the cover band at a dive bar punk show later in the night. It didn't go well. I could certainly run the kempers IR outs into the mains, but the "sound guy" had literally never done that before, and didn't know how to get that into the monitors... which there were only 3 - and one was for the drummer. So apparently the kemper was coming out of the mains but no one in the band could hear me through the monitors. It was a nightmare, and why I run the exact type of rig you run for those types of shows. 4x12 and a hundred watt head.
I can always turn down the halfstack, can't turn up a modeler when you're limited by the monitors and sound guy's experience with direct rigs.
With my cover band though? Never had a problem. Not once. Either we were supplying the PA and could take as much time as we needed to set up, or there were professionals running sound who know
exactly what to do with a direct/digital rig.
People say this all encompassing shit like "You can literally do any gig with a modeler!" or the opposite "A modeler would never work at any gig" and it's always both completely right, completely wrong, and completely dependent on the context.
Generally speaking, it follows those guidelines though.
Big cover bands, tribute bands, P&W, and high level pros all swear by modelers, and people who try to use them for club and small theatre gigs end up running them with a power amp and a cabinet because otherwise they couldn't use them at all - which of course defeats the purpose and "convenience" of using a modeler in the first place.