I went to work with Autozone in the mid-1990s. They asked some basic automotive questions, but it was the beginning of the end of the knowledgable parts-counter guy. Many were still gearheads, and worked on their own cars, but more and more today, few understand the basics, let alone complicated issues.
A few years back I went to one of the chain stores for points and condensers. The guy thought it was air conditioning.