You say you are trying understand why. Let me spell it out for you. There is no better device for training the "feel" of an aircraft than an AOA indicator. It works in all attitudes and all power settings.

Hold 20 units AOA in a level turn, feel that lite tickle great. Now hold 22 units, feel the ailerons hitting the buffet, great. Now hold 26 units, see how the nose is starting to wander, feel the elephants on the wing, look how much power you have in and we are still bleeding airspeed.