The cause of the Asiana prang was inadequate control of airspeed rather than inadequate monitoring.
To control speed you have to look at your speed and thrust.They never looked at speed which reached 31kt below Vapp with thrust stuck at idle all along. SFO is a bad example to discuss normal approach. Normal approach within +_10kts or half a dot below or above is straight forward. You pitch for slope and as thrust comes up you will change AoA to maintain it. In airbus FBW the TW couple is not going to take you to GS.