Truth about roller cams.... BEFORE you make the switch......

I just switched to a solid roller from comp and got a bronze gear.

I have a hard time believing it will be scrapped in 3k miles. WHo knows.. How do roller cams in late model producton engines hold up? Seems like they go past 3k miles ok..
I can tell you my bronze gear feels a little more "free" in the splines than what I'm used to seeing. And, your question has been my question, why don't cam grinders make them like the factory? But the gurus are saying it's because of the aggressive lobes need more spring pressure, thus a different steel. IDK to be honest