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Exactly. If a firing pin is meant to break, it will break, whether or not the gun is dry fired.
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If one looks at various firing pins most if not all are cushioned by stricking the primer. Dry fire a gun and the pin slams into the inside of the bolt. Some pins have shoulders and some simply are tapered which lets them slam into the firing pin hole which eventually elongates it.
If the shoulders that stop a pin become too beat up this lets the pin stick in the firing pin hole which promotes crystalization and breakage and the enlargement of the firing pin hole which can lead to primer flow back and piercing.
Also when a pin sticks in the firing pin hole it does not have to break off to let it stay there as on some models like the FN/ABL rifle it may cause the gun to go full auto even if the pin is not broken but just stuck in the elongated firing pin hole. '
On bolt guns its even worse as the gun may fire before the bolt is locked resulting in a catastrophic blow up and the bolt rocketing back with such force that if the bolt stop fails the bolt can be propelled back into the shooter causing serious injury and or death.