An answer to the question of how those fancy systems wind up sounding if you don't trip their limiter when putting whatever through them sound would be nice. How about the full skinny please?
A: e-drums, restrained backline not enough to be interfering in vocal mics, not covering whole venue but not giving a damn, Auntie can natter away to drums and vox and some bleed just fine, dancefloor @ something under 96dB thereabouts avoiding engaging the limiter.
B: full e-band backline IEM.
C: 1 mousepower backline monitors, e-drums and everything into the mixer.
D: live drums, IEM everyone.