As long as we are talking about subsonic flight, for a particular wing configuration, the stall is always at the same AOA, even during accelerated flight (pulling g) which is what makes AOA so valuable. Drop flaps or slats, contaminate the wing with ice, and you have a different configuration. If you are flopping around in a post stall gyration, AOA tells you which way you have to go to get the wing flying again. If there is ever a doubt about the validity of airspeed, AOA will let you know when you are getting near the wing's limits. There is a learning curve to use it, but it isn't very steep.
It boggles my mind to think that you have the probes mounted on the aircraft, and glass cockpits, and yet no one wants to do the little bit of software work to put it on the PFD.
Machinbird