Comment by jffhn

Domains are often not very deep, as a lot of people need to understand them.

I've seen smart people quickly figure things out and propose upgrades in a matter of weeks, on points lifelong experts overlooked, or were too lazy to dig.

Reminds me of a company that was looking for people good in both the domain and software, to bridge the experts/devs gap (which is often a bottleneck, information flow between brains being slow and unreliable). They found out that it was much easier to teach the domain to devs, than to teach software to domain experts, i.e. that software was the hard skill.