[robmcm]

I expect people said this about developers that just knew about TCP/IP and not how the PHY worked.

At every level of abstraction they is a boundary that people may not choose (or have time) to pass.

I'm not saying everyone should be forced to learn about every layer, but these knowledge boundaries exist everywhere, and I'm not sure what can be done to improve the situation...

[pas]

There's no problem with not knowing the deeper/higher layers. The problem is when someone outright ignores their ignorance, when someone doesn't even acknowledge their boundaries. And when those boundaries are set in stone. ("I won't touch the terminal." or "I won't touch C." or "I won't touch CSS.")