To be honest, I don't know. We're speculating based on what has been observed with production guns. I suspect there aren't a lot of these guns out there and the ones that are in the wild don't get shot a lot, so there won't be many (any?) reports of premature wear or outright failure. Of course, upgraded materials may also mitigate the risk.
Entire possible this is the case. I don't know enough about gun engineering to know if a materials change will offset the physical design.
Chris