Yes, angle of attack is the definitive way to determine the point at which a wing's stalls. Fine, I have no dispute with that. So, with no AofA indicator in my li'l 3-axes (plural of axis for those about to get into a spelling and grammar drift) microlight, how do those pundits of the AofA tell me when I am getting close to the stall? I'll tell you - it's called an ASI and it works extremely well!