This isn't very charitable. There's a saying about the shoes of the cobbler after all. The profession is large enough that we can have experts on, e.g., compile

This isn't very charitable. There's a saying about the shoes of the cobbler after all. The profession is large enough that we can have experts on, e.g., compiler optimizations, who do not care to know or bother with the tedious work of administering systems, applications, or data that have always and they hoped always would "just work." Maybe that's overly optimistic or naive, but they need not be excommunicated from the field. There are a great many things in this field that I don't know that I arguably should. I learn them when I need to.