My point is that it doesn't make them any worse at the game. They still have a full understanding of everything, they just have trouble verbalizing it.

And that is good for trying sell a product? Would you trust a mechanic that didn’t know what parts of your engine are called?

No, but that's a false analogy. She knew what they were called, but the terms for different types of weapons have changed a good amount of times over the course of destiny's history. Everyone playing now knows how the system works, but because the terminology has been changing so much it's hard to keep up, for a lot of people. 90% of the community still calls enhancement cores masterwork cores. For a mechanic, if the engines are the same, and use the same pieces, the terminology would be the same, yes?