Some of us are born with inclinations towards solving problems, engineering, and being a mechanic. I'm one of them. I learned soldering, replacing harnesses, set ups, etc. with guitars because I liked learning and doing it. Every time I pick up a guitar I subconsciously assess the set up and the state of the strings.
I had not thought of this before, but it reminds me of the military, particularly the Marines. They bond to their rifle and care for its every need.