This is what i'm trying to understand myself. But after various questions in various forums I have had no proper response. Only people going on about how useless my question is and that i should spank myself for asking such a naughty question.

Power meters have cadence limits normally 30-200rpm they also have wattage limits mostly 2000w. but surely this is because there is actually a torque limit. but no one seems to know what these torque limits are.