Dropping the slide on an empty chamber messes up your high dollar trigger job on a 1911, or so I've read.
Something about battering the sear, or sear bounce, or some such. It may not be hard on a stock gun, but after you just paid for a trigger job you don't want to be dropping the slide on an empty chamber over and over.

I saw all this too late last night, I'll test it out tonight and report back.