Not all band's perform at venues with the kind of lighting where you can simply say "2.8 is where it's at" that very much depends on where you're at
There is no one size fits all solution to such a subject as the conditions vary dramatically from venue to venue. Studio work it isn't (thankfully)
Any rock journo or journo knows that in tough light & conditions it's about getting the shot. Stop it down, open it up. When Mick Rock shot the stones
and the Who, he'd sometimes miss focus, he'd push his gear and film to its limits. I'm sure people today might say, blown highlights/ too shallow a depth of field. Way too much grain for my taste
There isn't & there is never likely to be a better rock journo then Mick rock. He's taken iconic shots no matter the aperture or shutter. "worries" about Grain/noise/ depth of field or anything else have ever stopped him.
http://www.mickrock.com/
To quote The Late, Great W. Eugene Smith
What uses having a great depth of field, if there is not an adequate depth of feeling?