Dry firing was hard on black powder guns and, maybe especially, for the original Colt cartridge revolvers which had the firing pin as a fixed part of the hammer. The 1903 Springfield had a poor design that allowed the pin to jam into the end of the bolt and was also bad. In fact, any hammer or pin design that allows hard pin contact with the frame is bad business. BUT, most, if not all, more modern designs block the pin in ways that prevent such pin impact so it is rarely a real problem. I don't hesitate to dry fire a S&W or modern Colt with a floating firing pin, a Rem 700 or Win 70.
No doubt a rubber erasure "primer" will absorb a little of the pin impact but that really isn't hard enough to make much difference.