In the 1940s, Ikeler writes, many sales clerks received extensive training to provide personalized service, sometimes in formal schools such as the New York University School of Retailing.
When I lived in Switzerland in the early 1990s, it struck me that a lot of people regarded retail as a specialty and people tended to really know their stuff (often for many retail fields there were certifications).
For outdoor gear, there is such a huge difference between
1. a specialty outdoor gear store
2. an REI
3. A general sporting good store.
We have become much more of a self-service economy, off-loading tasks to consumers in order to bring prices down. Self-serve gas. ATMs. Retail people who often don't know anything about what they're selling, leaving it to you to do the research.