I'm not sure I'm qualified to answer this, but wth, it's never stopped me before.
The first I heard of this was the other night, and the poster didn't mention any grinding or other modification to the pin.
It appears that the Schwartz system is such that the actual block can be displaced by the firing pin, and once displaced will stay that way, although what the friction issues (since the block will still rub on the pin) would be, I don't know....
Putting on Mas Ayoob hat for a minute: It's never a good idea to remove safety devices from a carry gun.... Strictly a liability thing, but expecting juries to understand why you'd remove the firing pin block
safety even though it's probably a smart move for your own protection, may be iffy....
IANAL and just IMHO....
If it's not a carry gun, though, it might make more sense to remove the block. The little pin in the frame ought not to bother anything, but you could cut it flush with the top of the frame if that's a problem.
(Gunslick or Lubriplate ought to handle the friction issues, btw. That may be the worst part about the Schwartz system - you really can't lubricate the stuff in the slide without taking things down way too far - removing the rear sights.)
Regards,