Some examples:
1. I constantly see EV owners install 60A/11kWh service, costing them on average $10k when their driving needs don't require it.
2. People thinking they need more than 300mi of range and think they will run out of batteries like they do on their headphones.
All of this needs an understanding of the aforementioned units and basic physics. But, you're not going to get that by just talking to people. Salespeople are especially not going to do that, they can't even do that for combustion cars.