I asked this elsewhere, but I'll ask it again here, and I am being completely sincere. Why pick things to specialize in at the expense of other things you elect not to?

Specialization is not free; it decreases flexibility, and would seem that it would decrease cross-pollination of ideas from different areas of knowledge. It increases income, for sure, but also increases the attendant risk that people won't have need for an X specialist right at that moment, or at least no one you would want to work for.

I'll grant that generalization is not free either. Someone who really needs an X specialist will pay top dollar, because the supply is likely pretty low. And people may not trust a generalist to go and implement some specialized X performing application.

I think there are opportunities and attendant risks for both. I really don't think either one wins outright. But, I'll be happy to listen to words of wisdom you might have on this.