Now here's some thoughts from an absolute beginner. :-)
If all we were to do was raise AOA to slow down, we would indeed slow down, but we would also start to climb.
For exactly how long? I can see that there will be an initial tendency to climb this way, but have you ever tried sustaining a climb in this fashion? You might be surprised?
You will have to increase the speed of the aircraft to get airborne. Ask your self what your going to use to so that. Elevator or throttle?
Jonty, you're comparing apples to oranges and you probably know it. I think this discussion is about the effects of controls in flight. I was hoping it was generally accepted among pilots that aircraft on the ground are controlled in a different fashion than when airborne. Do you use ailerons for directional control when taxiing?