Having a good feel for the plane prevents you from doing all sorts of horrible things and is essential for good VFR flying. In fact I would say that is the one thing that makes you from a standard pilot to a great, safe pilot.
How is AOA better than ASI for routine non-accelerated/non-high G and non high-altitude flight? It's not. Essentially same information.
Everybody wants to have the next whiz-bang stall/spin protection device. In a few years some will say synthetic vision is required to prevent CFIT. I understand and recognize its use but I don't need it now.
Here is a typical stall/spin accident from a few months ago, unfortunately fatal. Look at the attitude, power, airspeed (AOA surrogate) during the entire event.
PLANE CRASH FROM INSIDE COCKPIT
Money retrofitting planes with AOA trinkets would be better spent on instilling better basic airmanship for most GA guys. The two pilots did a lot of obvious things wrong, and having yet another gauge screaming at them would be unlikely to prevent the incident.