Of course no one wants to wait on anyone when money is involved. On a side note, I've never seen a concert go longer than 4 hours continuous. At least none that I've been too. Festivals, telethons and other things of course, but there's generally some gap-age in there while the bands swap sets. And the larger venues have power options beyond batteries. Swapping the 12 batteries on my sound gear takes slightly less than 3 minutes on location. Considerably less time at home since I have a table and other things to make it easier. And yes I plug in, when the option is available and the risk is minimal. It saves considerable time after the gig in terms of battery charge times.
I'm not an industry person by no means. And I don't really desire to be one, although I'm not past making a buck. I merely want the capability to record anywhere, anytime, under any conditions (including bad weather). With pro-like results. Something which most pro's seem to be incapable of doing. You can't bank on power options in the middle of a hurricane. Odds are good that you wont have access to any. And battery plus inverter options are not ideal when just trying to survive, or in flood like conditions. Not that my ideal rig does much more than a glorified soccer mom could do. I'm just willing to spend the couple extra bucks for the pro-ish capture components. Which doesn't leave much left for pro-ish rigging while keeping to a budget of total device costs cannot exceed the cost of my vehicle. And I don't expect to be driving anything other than sub $20K vehicles in my lifetime. Baring super inflation, which seems to be the current political agenda.