Feedback is not a mystery and it is not a sign the system is too loud. It is a loop reaching unity gain at whichever frequencies the room is already emphasising — which means flattening those resonances buys back real, measurable level.
A microphone hears a loudspeaker. The loudspeaker is reproducing what the microphone hears. That is a loop, and like any loop it has a gain — how much bigger the signal is after one trip round.
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