Don't know about you full aviation background, mine was 100% USCG. Old school pilots believed in understanding every nut and bolt and system in the aircraft down to the last detail. The newer trend was to follow strictly published emergency procedures when necessary.
For those of us that spanned that transition, integrating the best of both saved a lot of aircraft through the years. Sometimes emergencies crossed over because some system failures were not pure and anticipated by the people for writing the emergency procedure section of the manual.
The nice part of seeing both sides of that discussion, I have always been driven to knowing how and why systems work and yet be sure to follow the emergency procedures prescribed.... but when the solution didn't work...it was nice to know where sometimes something else would get you through the emergency.
So I learned just about everything I needed to know to keep my systems on my trawler operational. That's not to say I could repair every one with tools and knowledge onboard, but I knew enough about the system to troubleshoot and identify the problem and most likely fix or bandaid till it could be fixed properly or replaced.
Rome wasn't built in a day and being the consummate cruiser doesn't happen overnight. It the methodology you approach it with that makes the difference.