I think this has been made in purpose.
Every machine has to have one weak point which prevents damage to other parts. It's like breaker in electrical circuit - you don't want to replace fried wire inside the wall, you just replace the breaker, which is failure easy to find and easy to replace.
Firing Pin Retaining Pin is the smallest, not expensive and easy to replace part - preventing damages of other action parts.
Yeah, but...
Not every part of a gun's design requires sacrificial parts. That a sacrifical part was needed makes me wonder about the viability of that way of retraining the firing pin.
The firing pin stop of the CZ-85 Combat and pre-B 75 designs is not a sacrificial part -- it doesn't fail. And Tanfoglio has made a lot of guns (including the Tanfoglio TZ guns and the Tanfoglio-made Witness line (both near-copies of the CZ design) that use a firing pin stop. Tanfoglio calls it a "firing pin retainer" rather than a firing pin stop.
If CZ had just retained the firing pin stop used in the original CZ-75 design there would have been a little more production cost but there would have been a lot less complaining and hassles for buyers and, arguably, quite a bit fewer guns returned to CZ for service. I suspect that CZ has lost more money dealing with broken firing pin retention roll pin issues than it has saved through lowered production costs. It certainly made many of us question the thinking behind that particular design change.
As I was writing and editing this reply, the message above was posted, and Scarlett Pistol's reply offered a variation on an earlier suggestion and that seems an even-better idea than the one I first wrote about. This post is a good bit shorter because of Scarlett's reply.
With the original Browning Short Recoil Locked Breech guns, the firing pin spring had two functions: 1) return the firing pin to position after the shot and 2) limiting inertial firing pin movement that could cause ignition if the gun was dropped. That design did the first part well, but didn't always do it with the second part.
For guns with firing pin safety mechanisms, 2) is not an issue, and a lighter firing pin spring along could probably be used, which would reduce the force with which the firing pin spring sends the firing pin to the rear after the primer strike. A weaker spring alone might work.