[g.willikers]

Hangup = gun not shooting, for any reason, requiring further manipulation to make operational?
(I just made that up).
The only time a choice would have to be made, of whether to use the slide lock release or the slide rack method, would be if the slide was, indeed, locked back, after shooting the gun dry.
If, after loading with the slide lock release, the gun then just goes click or doesn't go into battery, it's time to rack the slide and clear it.
Same as if the slide rack method was used, in the first place.
I just don't see any downside to using the slide lock release.
It is so much faster to the next shot.
If the gun requires another manipulation, there's nothing lost by using it.
The shooter is in the same boat, either way.
If they're stuck standing around dumbfounded, all confused like, with their thumb you-know-where, well, it's obvious who's to blame, there.