I bet you that a few passes over a whettstone would get rid of those marks without affecting the usefulness of the firing pin.
One would think. But other things might come into play here and that would vary with firing pin and the gun.
You might have to take off too much, if the laser etch is too deep (they’d have to make it deeper I’d think because of the age/wear #strikes thing). Then is a possible non-detonation of the primer, or worse if you altered the shape too much (more pointy), rupture the primer on impact.
The other thing to consider is just how frangible is the laser mark. I read once where a serial number that had been roll stamped was filed off and used in a murder and the gun recovered. Metalurgical analysis and some other techniques revealed the S/N by the change in the metal UNDERNEATH the S/N despite it being filed off.
Here, the case sample is much, much smaller, but analysis and image processing techniques are also much farther advanced that a couple of decades ago when I read about it.