The WHAT??? I've learned to make do with keeping the horizon a stable line in the windshield. Seems to work.
Um, right. How does that help me know how hard I can pull exiting from a loop without exceeding stall AOA? Or turn steeply using 'bank and yank' without departing?
At the risk of turning this into a mutual admiration society Chuck is right on the nail with this:
Actually the airspeed indicator can cause some real sloppy flying that can be observed by watching poorly trained pilots chase it during climb, resulting in a roller coaster climb path.
The AOA indicator is far more useful and accurate.