Professionals with paper vs non professionals w/out paper.
I had three main teachers in my career as a mechanic.
My Father, an old school hot rodder who routinely put certified mechanics to shame (also a certified jet engine tech, but that's another talent, though related.
This man could tune the much maligned 'Quadra Junk' carbs and make them sing, where other certified mechanics have tried to tell me they are untunable junk. This man was my first teacher automotively
Jeff, an ase certified tech of over twenty years experience. He filled many gaps in my knowledge, but was a bit of a prima dona.
Isidoro, who learned his trade in Mexico, where you don't replace parts, you rebuild them.
Jeff was always very strident about knowing more, and that I should never question his assertions, but I caught things that slipped by him, and mistakes he made, more than once.
My dad and Isidoro never acted like they couldn't be wrong, and were always willing to listen to an alternate view.
I know people right know who are 'trained' and certified techs whom I would not let touch my car.
While I have much respect for those who are trained in their profession, it does not follow that they are always right, just as Jeff wasn't always right (although he sure thought he was)
I am impressed by a degree to the extent that the degree holder sounds sensible and doesn't pull the 'I have a degree, so I'm right and you're wrong' crap. a degree doesn't make you right, it increases the chances you're right.
If you approach with that attitude, I lose respect rapidly. If, on the other hand, you educate rather than belittle, my estimate of you goes up both as an authority and a person.
So far among the engineers Whitefish has my attention.
Afreegeek I've found sensible on threads where he actualy speaks about his trade, rather than just throwing in a random comment that stirs the pot without realy saying anything.