Sounds like most or all of the OP was in reference to "tuned"
1911 actions.
No, the same impact/wear on hammer & sear doesn't happen
every time the pistol is fired. During firing cycle, the trigger is
still held to rear, as slide recocks hammer.
The hammer is held cocked by the sear when the slide is at full rearward travel, even if the trigger remains depressed. When the slide travels forward to battery the hammer remains cocked by the sear, no matter the position of the trigger. When the slide slams into battery, no matter the position of the trigger, proponents say shock is imparted to the hammer which bounces on the sear. To posit that this shock only comes from chambering on an empty chamber and not a loaded chamber does not seem to make sense. If a hammer is going to bounce enough to damage a sear, it is just as likely to occur every time the gun goes into battery.
Maybe Jerry Miculek has the trigger coming of the sear before the
slide recocks the hammer, but no one else does!
And you can see peening on slide stop shaft and barrel lugs,
where slide's forward momentum is stopped, during return to
battery. Repeated slingshotting of empty 1911A1s is harder on
those surfaces than firing, without the slide losing velocity to
pushing a round out of magazine and driving same into the
chamber. That peening of slide stop shaft and barrel lugs
(and even links, to a degree) were part of the GI .45's rattly
sloppiness. and reliability with no lack of safety or danger of uncontrolled firing. Part of the recognition of the original design specs.