Well, some of the issues with voice stealing come down to the player... Sometimes, in a dense mix, do you REALLY need to layer piano, strings, horns, a pad, and an organ?

Or is there a voice already programmed with fewer voices that will serve as well? Part of the art of arranging is NOT stacking everything on top of itself all the time. Remember, even a symphony orchestra only has about 80 players playing, nearly all of whom can only play one note at a time. Now understand that the strings are really only playing a maximum of 10 notes at a time (divisi on 1st & 2nd Violins, Violas, Celli and Dbl Basses) and you actually reduce the notes played drastically under that 80 players.

So yes... you can push the polyphony limits of ANYTHING by doing ridiculous things. But back in the real world, with care and forethought, you can avoid it quite easily, and quite musically.