The marketing of products is horrible. No good explanation of what the products do and why. Most of the salesman, and there are exceptions, don’t understand the products they are selling. If you’re able to read product descriptions and understand all they’re saying, you are a rare breed indeed.
Further, many of the higher end products are just not available in the store to see. And it’s very geographically dependent. AB testing is not done very effectively aside from the lack of availability of many products. Which makes sense as each Store is pretty much required to buy anything they show you.
It’s an awful business to be in, and requires someone who truly is dedicated to the craft and not necessarily interested in making a lot of money. The true craftsman who sell hi-fi products, if you're lucky to live near one, are really really nice people and you can learn a lot from them.