FDs should be switched off if they are not to be followed is a general suggestions. It is applicable for any planned situation like visual approach. Steep turns are not done in commercial aircraft. Stall is not a planned manoeuvre. Once the aircraft has stalled at lower altitude immediate memory items for recovery should be applied i.e. lowering the nose, application of required thrust etc. Pilot who is doing the recovery should have the knowledge that FDs don't provide unstall guidance and ignore and just fly the attitude. If it's not in the procedure why waste time switching off FDs? It's a serious event and should have a standard procedure.