I'd argue the best individual contributors don't have the skills to be the best mentors or managers. These skills can be learned only by sacrificing IC value, m

I'd argue the best individual contributors don't have the skills to be the best mentors or managers. These skills can be learned only by sacrificing IC value, maybe just temporarily. It seems this industry is getting better at realizing IC skills may be prerequisite for any successful mentoring or managing. The breadth of knowledge is only getting bigger, so if you aren't an expert in some area, what have you been doing, and if you are, why aren't you sharing it.