This is very true. Having a mental map of how things work is vital for correct (and good) troubleshooting. Also, a ton of people use abstraction as an excuse t

This is very true. Having a mental map of how things work is vital for correct (and good) troubleshooting. Also, a ton of people use abstraction as an excuse to not learn a body of knowledge that contains fundementals (especially on the systems side). In comparison to network engineering for instance, where having (quite) low level knowledge of how protocols work and interact with each other is vital.