Well all this lecture is wonderful and logical But flying wise.. When the Vapp is close to PFD VLS , the aircraft is very unpleasant to fly with high pitch attitude and the autothrust struggling to keep your bug just on top of VLS. That means something is wrong and not just AoA error. Otherwise the aircraft would behave a little bit better.Remember that all protections are triggered by PFD speeds and not MCDU speeds. If you enter AoA protection it s because you were in the PFD AoA threshold and not MCDU VLS.
Consequently fly your PFD and airmanship dictates to land at Vref+5 in any aircraft.
Any aircraft should be flown in a conventional way and as I know your primary instrument is the PFD and not the MCDU.
Many airlines suffered hard landings because of this matter and requested their pilots to have a decent speed on final and not fly in the backside of the curve just because the books say so. Fly the aircraft and not the computer and remember how you flew your cessna 172 .