This is pretty much what I believe. I tried to say it, but my lack of professional experience and credentials prevented it."Familiarity" and "similarity" are the keywords. It is not about fillling out a dance card of six or eight guns. That practice leads to failing to take a safety off, or confusing a safety with a SA/DA decocker, or having no "feel" for the firearm when the shooting is up close and personal.
When I was more dedicated to practice, I found that I could shoot almost any rifle or handgun well enough to defend myself. But I also learned that I needed several hours of intelligent training with my SD choice, immediately prior to carrying it, to feel confident of my ability to shoot it in a stressful situation. For this reason, all of the SD weapons that I will actually carry (now) have the same basic function characteristics (striker fired, or DA only). I never carry anything with a lever safety mechanism, because that is the major difference that can not be overcome with a few hours of practice.
I love my revolvers, 1911, and CZ's, but I only shoot them for fun, after my first attempts to feel comfortable with them for SD. They are perfectly fine for SD, but not optimum in my particular case.