Personally I think Melvin has a "brown" belt in Bullshido if you know what I mean. 💩
OK, how's this!20 yards, with any sort of a reasonable handgun, (Phoenix Arms, excepted) is absolute candy. We train at 3 to 25 yards routinely.
Anyone who can't keep a full magazine, (or cylinder) in the kill zone on a Transtar II target 20 yards, needs some serious remedial training, or needs to find another line of work. I'm pretty confident at 50 yards with either my Glock 21 or my Taurus 9's.
My fellow instructors and I, used to hit the old FBI targets at 100 yards with 2 1/2" Colt Detectives for the heck of it. You would have to range in, and hold about 18" high, but it made for pretty consistent hits. 20 yards? That's point blank as far as I'm concerned.