Winchester 73, please stop calling it hammer fanning. NO ONE in CAS(which I compete in) calls it hammer fanning. The proper name is called Hammer slipping. Its Not as fast as movie fanning, but its easier on the internal parts, and is a more complete action, less likely to short stroke the hammer.
Oh and FYI its the same technique taught at the Defensive Revolver Single Action, at Gunsite.
So ya, those to people, will resort to standard techniques if they use there SAA for self defense. That technique is called slipping...
Secondly, you keep ignoring the fact that sass does a good job of practicing other skills. Namely transitioning between guns and moving and shooting with pressure.