Well, that’s the English language for you!
Of course I don’t use the wipers at M0.84 - everyone knows that M0.82/280kts is the limit...
To elucidate: even when not in use, they stick out in the breeze. How much extra fuel is burnt over the lifetime of the aircraft compared to a setup where they retracted? On some cars they retreat into more stagnant air in the scuttle area.
It’s also annoying when the speed and clamping forces allow resonance and the whole thing loudly vibrates for much of the flight.