That’s a good point, but domains can be broadly applicable. For example, I worked with two programmers who knew data structures and I/o to a great level. After

That’s a good point, but domains can be broadly applicable. For example, I worked with two programmers who knew data structures and I/o to a great level. After they left my employer tried to replace them with teams and teams and couldn’t. There are lots of companies that need data structures and I/o.