But, this was not a complaint about the lack of PA. That I'm fine with. It was an attempt to explain why some of us feel obligated to use big (however you define it) stage rigs.
I can understand the rationale, but that's also why I'm a bit confused. Drums can only get so loud (no matter who is hitting them or how hard). I've played with Neanderthals with clubs that break drum heads on a regular basis and yet it still ain't all that loud that even a decent sized combo couldn't keep up with or be even louder than.
And given that it does not take that big of a rig to be louder than the loudest of drums, I wonder at what point it's better to utilize a PA so the drums and bass can both be equally presented with guitars/keys/etc..
That is my biggest issue with this idea of a large bass rig. I can understand outdoor shows (even with a PA) where the low end gets lost into open air on stage and only a large rig will suffice as a personal stage monitor. But even then all instruments (including the entire drumkit) is going through the PA.
I don't understand why the need to blow away the drummer when the drummer has no control over his volume except to play quieter (as he cannot play louder than what is acoustically possible).
It's entirely possible that my idea of a good mix between the drums and bass are completely different from others, but I don't really think the bass should be drowning out a drummer any more than a guitarist should drown out the bass player.
What exactly is the big bass rig competing with again?

