[zamadatix]

Buying a car factors too much personal preference in to be analogous to diagnosing a particular issue. I think a better analogy would be when you go to a shop to get your car fixed. Depending how obvious the problem is you may be given a single obvious course of action or be given a list of possible problems and a review of possible solutions. If it's severe enough you may be inclined to ask for a second opinion from another shop just to be sure but you don't default to questioning automotive repair practices because you go and google how a transmission works that week. Not because the first mechanic you see is always right but because there are multiple people that spend their lives trying to figure these things out available to you and your best bet is to always try to leverage them not try to become one of the alternative experts overnight.