On the subject of retail wage slaves not knowing anything about what they're selling -- we are partially to blame for that. Once upon a time, retail salespeople were on commission, and they knew a lot about everything. They could tell you why that TV on the end is $300 more than the one you want to buy. They could tell you why something doesn't work on the washer you just bought from them. They knew how to hook up the stuff you bought, and they'd do it for you if it kept you from returning it (chargebacks were an absolute pain).
But we didn't like their "high-pressure" sales pitches (usually for very good reasons). We didn't like the idea that someone was getting paid based on what they sold me, so the model changed. They started hiring people for just over minimum wage, but they'd still train them on product knowledge (I got paid to do this for Lowe's about fifteen years ago -- pretty good gig!). But people making just over minimum wage don't care about product knowledge -- they're clerks, not salespeople. Retailers realized that the money they were spending on product training wasn't getting them any return, so they stopped.
So now rather than informed salespeople who are trying to sell you something, we've got wage slaves who don't even know where to find the bathrooms in their store.