Takes two hits to incapacitate an attacker (singular).
Since we are using data, what is the average hit ratio? About 50% - close enough.
Based on those averages, 4 rounds (total) would be fired to stop a single attacker.
Entertain the idea of two attackers; using those averages 5-6 rounds may be insufficient.
Lethality (death) does not infer quickly incapacitating.
The flu can be lethal but it is not quickly incapacitating on contact.
For self defense quickly incapacitating is at a premium; obviously a 9mm that expands to .60 has better ASAP potential than a .22 lr. (same shot placement is assumed)
I don't disagree with your logic at all, and for a time my minimum comfort threshold was 12 rounds for capacity.
I have moved to a j frame after a lot of practice. I just enjoy it and can get the fastest draw to bull's-eye hit with them.
Anyway, I follow civilian self defense shootings. These are very much on the rise, or seem to be( we may need to wait to see the stats for the last couple years) , due to the massive crime wave we are currently seeing (many factors, no cash bail, etc). As an nra member I get shooting illustrated, and I follow it there and several other online sources as well.
All that to say, after a few decades of following self defense stories I've never seen it play out the way you state it. Again, I understand your logic. There are times it is definitely a semi auto near to hand for me. I have never found a single case where it ended up with "if only they hadn't had a revolver ".
5-6 seems to be enough. It doesn't mean all 3 home invaders or criminals are "taken out" but who cares if it's enough to run them off and call for help?
I have, however, seen many stories of ccw folks dying due to not remembering a safety, one lady using a 22lr but oil ruined the priming agent, a jam or limp wristing incident etc. Too many stories like this to count.
Getting back to the topic, if the Taurus is proven it makes the most sense for ccw. 38 is a good mid level round, it's about 30 a box of 50 for range ammo if you don't reload but for self defense carry against 2 legged threats of the 3 mentioned it seems your best choice.