My Honda has a buzzer that goes off with an in dash red light that comes on and automatically cuts throttle in half if the engine gets heated for any reason. It only went off twice in 16 years, once because of a huge clump of weeds over the intakes and once because the impeller was worn out.
Whenever I'm on weedy lakes I always periodically gun the motor in reverse then forward which usually blows the weeds off. If not then I lift the outboard and dislodge the clump of weeds. Even the electric motors they call weedless are not really weedless.