Nobody bigs it up. There are few moving parts and most of them can only be tightened one way.
Up to a point where you are adjusting things with springs that are operated by cable, there is room for experience to creep into the equation.
You do get the odd 'expert' who does lots of chin rubbing and blames some mishap on an under-tensioned this or an over-tightened that... it makes them feel good.
There are also the folk who feel that their hobby (sport) has to somehow be the exclusive preserve of 'real' practitioners and who deem anyone lacking mechanical knowledge an amateur or part-timer. That's just the human ego at work and is harmless.
But generally things are easy to get rightish - and rightish is all that most of us will ever need.
Having said that, little that I have ever adjusted has been set up as well or has stayed right so long as something done by my LBS.
I wish I had his skill, but I do not. I do OK, which is enough.
I do not build wheels, so to me that is a dark art and I do 'big it up'. The more people tell me it is simpl, methodical and therapeutic, the more convinced I am that it is really a Jedi dark art that I'll never grasp.