Since improper flying technique can get an aircraft into stall, a pilot is trained for and is expected to recover from such condition, promptly and efficiently.
An aircraft with handling qualities which make it unlikely to recover a stall isn't suitable for passenger transport.
A stall as encountered by AF447 is a stable flight condition outside its authorised operating envelope, perfectly recoverable in airworthy passenger transports, and far from the second stage of PSG (post stall gyrations) and later, third, stabilized spin. Both later conditions may be unrecoverable in certain types and conditions.
I have flown with and without AOA indicators. They don't replace airmanship and flying skills.