I rarely just let the slide go on an empty chamber. I just don't like the sound it makes personally.
But years and years of using Army Beretta M9's have shown me that it probably doesn't matter in that weapon at least. Every time you go to the range, people are letting the slide go forward to an empty chamber all the time. And those of us who believe this causes stress that can be avoided, we all cringe when people do it.
When I get in my car, I COULD slam my door every time. I doubt it would do much harm to the door for some time. But after a while, the window WILL break and then, the handle will break. While cars and handguns are very different animals, I still don't slam my car doors or my gun slides. Just something about the sound makes my ears hurt.
Only a biker knows why a dog sticks his head out the window. -Unkown
"A government big enough to give you everything you want, is big enough to take away everything you have." -Thomas Jefferson