Snowfalcon2
Some sort of airspeed sensor (as opposed to groundspeed, as provided by GPS and inertial) therefore seems fairly indispensable, at least for critical flight regimes at high altitudes and approach/landing phases where the local wind needs to be considered.
Angle of Attack works just great at approach and landing speeds. AoA is the primary speed sensor for carrier landings. At cruise speeds, it's not sufficiently sensitive.