[jaredklewis]

I think it’s usually helpful if your knowledge extends a little deeper than the level you usually work at. You need to know a lot about the layer you work in, a good amount about the surrounding layers, and maybe just a little bit about more distant layers.

If you are writing SQL, it’s helpful to understand how database engines manage storage and optimize queries. If you write database engine code, it’s helpful to understand (among many other things of course) how memory is managed by the operating system. If you write OS code, it’s helpful to understand how memory hardware works. And so on. But you can write great SQL without knowing much of anything about memory hardware.

The reverse is also true in that it’s good to know what is going on one level above you as well.

Anyway my experience has been that knowledge of the adjacent stack layers is highly beneficial and I don’t think exaggerated.