Sorry, I beg to differ. Doesn't matter how good the PA is when your average FOH is primarily concerned with limiting volume and dynamic range to sound more like a pop record than a concert. A product vs an event, big difference.
Queen in a big wooden hockey arena 1979, with zero acoustic treatment, sounded better than 90% of the live sound I hear these days. This was before time alignment, before DSP and mutuband compression. FOH used their ears and worked the room, nasty nodes and all, and pushed it till it sounded good. That's an event, not a product.
Deep Purple, breaking every current live sound rule, showing us how it's done. No IEM, no monitors, not even a wedge for the singer! Just talented dudes listening, enjoying themselves and playing their asses off:
If things don't sound compelling onstage, I won't be compelled to play my best. I need cabinets moving air behind me and to feel the place shaking. When a band feels that onstage you get a performance, not a product. Unfortunately, transformers and speaker cabinets weigh a lot, tough shit. Bring it, and give them something to remember..