I’m the OP. Thanks for this wide ranging discussion.
My opinion about dropping a slide on an empty chamber has mellowed.
I still believe modern in spec guns will not be substantially harmed by this practice, at least not for tens of thousands of rounds. During this time other gun parts will wear out. Very few shooters ever put more than a few thousands rounds through a gun. For them, this kind of wear will not be an issue.
I agree that slightly riding the slide to reduce slamming is not hard to do and would certainly delay long term wear. It’s also just polite, and even professional, when handling other people’s pistols, whether they ask for such an accommodation or not.
Now, on any expensive customized gun with more delicate, fitted interfaces, I can see that educated owners would handle them so they will last longer, reliably. I’ll bet those owners treat others’ guns with appropriate respect.
I went shooting my FS M&P 9mm yesterday. Out of habit, I dropped the slide using the release on an empty chamber. This thread washed through my mind. The next time I had the opportunity to close the slide on an empty chamber, I again used the slide release but slowed the forward motion a little with an overhand grip. I smiled.
That wasn’t so bad CB3! Maybe this forum can teach an old dog new tricks.