Such an "expert" will always make faster hits with a "lesser" caliber.
That may be true, but, a hit is hard to ignore. Interesting anecdote, one time I was arresting a little guy, he hit me 8 or 9 times before I hit him and ended the fight. He was at the time the Golden Gloves Featherweight champ in Juarez, Chihuahua, Mexico.
Further...
An "effective" hit with a 44 won't make any practical difference over an identical hit with say a 9mm, at least in the non anecdotal realm.
Surely you jest? Parrot "internet wisdom" all you like, however, in real life Mr Murphy is alive and well. I have NEVER had faith in the 9mm, probably never will.