Cranky comment, for which I can be attacked as much as those on this forum please, but I have a "friend" with whom I have chatted a bit, but a guy who I can't talk out of "pushing the living **** out of his saws chains and bars." Something deep in his brain stem persuades him that the harder he "pushes" on the saw the more cutting he gets done. (Yes, saws have dogs / teeth and we all often "roll" the cut on them - but this guy is different...) As a consequence this guy gets a few cuts with a new chain, bar cleaned up for him, etc. but then he is working with a spinning mess.
I don't carry a metal detector around with me, and I cut into trees with some frequency that have old staples and wire and nails, etc. in them. I work beside old stone walls that have done some falling apart, typically covered with a lot of nasty spiky briar, etc. and I "touch a rock" from time to time. I get the privilege of using chain sharpeners in a distinct relationship to working with saws.
My chains don't look like yours. But my "friend's" do. When my saw gets into non-wood objects/conditions, I swap out the chain. He doesn't. And I think he just pushes harder.