I thought they could adjust the blade pitch for wind speed, or shut it down completely when the wind is too high.
You’re correct, BUT the blade pitcher thingy has to work.
I thought the blades were fixed pitch and governor controlled but I would think that the blades could be adjusted for wind speed as well ... something to research ...they do have brakes since I’ve seen some turning and some not. Also, they could be directional controlled - pointed into the wind ...