Scully nicely posted Mr. Hilton Yam's gracious explanation of why a G.I. 1911 was, if not immune, at least far more tolerant of slide dropping. A 1911 is capable of being set up verry nicely, far more so than probably anything other than a nice Smith wheelgun. Having set the 1911 up, it makes little sense to batter it down. Just like why you do not fire a tuned S&W wheelgun single action. It can be done, but it is less than good for the carefully stoned and shaped sear.
But, Yam also says in anther post, that slingshotting the slide after an emergency reload induced more failures in courses he has seen than tripping the slide stop. So, use the right technique for the task at hand. Can't be too difficult. Let's see now, hmm threat still standing, gun is empty, reload and trip slide stop. Prepare to engage. Done. End of watch, stage, whatever, remove mag, eject round in chamber, lock open, verify empty chamber, ease slide down on empty gun. Engage safety. No need to trip trigger, except in confused settings like IPSC, IDPA, certain military formtions, who prefer AD's to safe guns. Oh, well.