> And in CA, at least, state law forbids manufacturers from requiring cars be serviced at a dealership as a condition of honoring the warranty.
People assume it's better there, and since it's free (i.e. warranty), they go.
My evidence is reading car forums. It's not evidence to you since I can't share it, but it is for me. On top of that, to the best of my memory, I do not personally know of a single person (in my entire life) who has ever gone to a dealer for service except when they had no choice (i.e. warranty or dealer only part purchase). (And yes, I know that's not evidence either - especially since you know nothing about me.)
Someone I know once mentioned that someone they know went to a dealer for service and we thought that was the most bizarre thing ever. (i.e. We wondered why are they wasting their money.)
You clearly have been to car dealer service centers - is that for warranty work, or by choice?