Todd, your point is extremely valid ref the incident with the guy with the hammer. As we had discussed briefly in College Station, I think that sometimes officers (like me) get themselves into situations that make reholstering quickly necesary. A little less testosterone and adrenaline induced stupidity ("Oh, that looks like fun....watch this!") can allow officers to stand off and holster most often in the manner you mentioned. As I said before, there is a lot more info to go with that scenario.
Dr No's last post above hits on what has happened to me most often. Suspect's who are unarmed, uncompliant, and unimpressed with your blaster. I have had to explain in court to a jury of their peers that the muzzle strike is not "pistol whipping". Sometimes it wouldn't be a big deal, in other situations it would. The calculated risk of holstering without looking is just that. "Do I want to get hit first in this fight or do I want to maybe shoot myself in the leg. Well, I've done this holstering thing a lot of times and I haven't shot myself in the leg yet, but I have been hit a few times........"
I also think that different approaches to police work can often negate the need for the reholstering quickly. However, I don't think those different approaches are better, nor are they necessarily worse.
If I take this guy down now, will that keep the crowd from joining in? If I back up will that embolden him? If I go forward will he think twice? Usually one of those kind of choices leads to that other choice.
Mr Armstrong also has a lot of experience and has a contrasting viewpoint. That means the need is not absolute.
Ideally, we should never reholster without looking. Jamming the gun in the holster quickly and without looking is unsafe. Realistically, in my opinion we should train for it safely (sims, red guns, dry, etc) because it may be necessary on the street.
Because it is good for me on the street should it be good for the range? Uh, no. We also don't have backstops on the street, but I don't think we should pick a convenient parking lot to blast a few practice and qualification rounds downrange into the neighborhood. We train as close to how we fight as we safely can.
"Hard break" and "holster reluctantly" are good training.
Best