You tired to describe it.
I arrived there due to tow things: experience in training (in a course upon by a Texas concern) and the FBI's conclusions.
I encourage everyone to avail themselves of quality training.
I do not think that The FBI training Academy has ever attempted to "market" anything to me.
Regardless, what I say and what I so can have had nothing to do the recent availability of surplus .40 caliber pistols on the market.
That has been due to decisions at the agency level--for many, many agencies.
Frankly, I don't know how many civilian shooters have been influenced by any of this. Few take training, and far fewer take the time to research the literature on this subject.
Some years ago, when I was trying to sell my SR-9c, one prospective buyer turned it down and oped tor an SR-40c.
He was convinced that the greater recoil, and the more impressive hits on plates, would somehow translate into greater "knock-down power" in defensive shooting