I've got overheads and kick mics on the drummer, I mic my amp, the Bassist and Keyboard player D.I. into the mixer. The Keyboard player has his own amp. The full mix is only for the IEMs and the audience hear only the vocals and keys through the mains, plus the backline (and drums acoustically).
Does anyone put the full shebang through the mains ? If so, why ? (or why not !)
Lack of planning on your part does not constitute an emergency on mine.