Loading and shooting a revolver one handed was taught long before 1986. (and it isn't that much different than loading an auto one handed either) I guess it must have been abandoned again by then. The suggestion that the outcome would have been different if the agents had semi autos is just as bad as if they had more powerful handguns. However those were two of the first things the gun "experts" jumped on after the shootout. The only new thing I can think of that came out of the FBI shootout was 'you have to have a high capacity semi auto'.

Firearms trainging changed a lot after 1986, but the result seemed to be officers shot worse during requalification than they did before. Within a few years of the shootout it was hard to tell by officers habits that it ever happened at all.

But what gets me the most is watching officers shoot for requalification. Don't they realize their life depends on their ability to use their weapons?