This has always been the root of my reluctance to ditch the amps. I love the sound of my rig and wouldn't want to go down the route of the alternatives (Eich etc) to recreate the physical effect of having an amp on stage. Note I'm not talking about sheer volume-induced sensation.
Your perspective is a welcome addition, and rather better than the IEM sneering that we endured a little while back. I get the idea of IEM, but would just miss the physical aspect of a sound source behind me. Even on a big stage, I like that bit of the stage where it has effect. It's a kind of oasis.