I've bought a bunch of new cars in my life. I've never had a sales person who knew basically anything about the cars they were selling me. I have however had a variety of very good salespeople, their value has never been in explaining the car to me but in making my purchase transaction straight forward and reasonably quick.

All of the sales people could tell me how many doors each car had and what color it was when we stood next to it, but that was about it. Many of them could look up if other near-by dealers had the exact combination of options I wanted.

If sales person training about the actual cars exists, my experience indicates very few new car sales people take advantage of it.

Concur. A Toyota salesperson was once unable to tell me what the highest trim level of a Highlander was and how it differed from the model they had. Seen staggering lack of knowledge in all things, not just tech.