You’re missing the point Cinders. I’m not advocating butchering your rifles, and I’m not saying that stoning the cocking piece is something everyone should go out and do.
It is however and essential requirement sometimes as cocking pieces and be damaged by previous “adjustment” or stoned to unsafe angles. And as a part of setting up a trigger nicely this step can be helpful, especially if you don’t have a large assortment of spares to selectively fit from, or a surface grinder.
Yes it is possible to go through the case hardening, and yes you need to bear in mind all the other related aspects of trigger setup, so well covered in Peters articles.