For me, any is too much. I want to see musicians interacting. That is where it is at. But I am fully aware that what I want is not what everyone wants.
And when it goes wrong, it is grim. We did West Side Story at work (FE college). The Perf Arts dept needed a band. I was young and foolish. How hard can it be? I downloaded it all on MIDI files, tabbed it out through Logic and off we went. WSS guitar, bass and drums. But I had a piano track on CD becaue the potential for disaster was too much. I was not THAT foolish. We had a silent pit and the guy running playback/monitor was stoned. On the CD the tune before the Act 1 finale segued into "Tonight". The stoned guy heard the number before Tonight slowing down and ending so hit stop.The actual track continued on the CD, Tonight starting at 2:36. There was no way he could cue that up. There was a pregnant pause and I started to sing accapela. The cast did the whole routine accapela, dance moves to the non existent orchestral hits and all. In retrospect it was comedy gold. The on stage energy levels went throught the roof.