Understanding why a card is good and it's probably good to understand why the cards are in the deck you're playing rather than just playing them (although, experience is a good teacher). But your comment Poo Poo'd on everyone because they got on board with a concept after it was popularized by a professional player isn't right either.
You're assuming that people didn't understand or try it before, but sometimes cards don't work out because of an unfriendly meta or the deck was constructed poorly. I used the wheel analogy because it fits. We all use wheels we know how good they are. We don't need to necessarily question why they're good.
If you take the analogy a little further then, Reid Duke would be to magic, what a professional race car driver is to his car and it's wheels. The drivers don't always work on the cars that much, sure they have some basic understanding of the mechanics, but most of them probably couldn't design a race car. A few can, maybe, who knows. They are, however, fantastic drivers, and they understand how to take a great car and drive it to the top. Good magic players can basically do the same thing, with a well built deck. It's unfair to look down your nose, or criticize someone else because they pilot a deck developed by someone else. They still have to play it right, understand how it handles, and "put it through the curves".
I've got a pretty busy life, I'm sure most people do. So, I'm only an FNM warrior most of the time, and certainly not a professional, but I do frequently netdeck (tweak here or there for the local meta). I don't have the time to test and develop a deck from scratch like Woo or some of these other guys. They do, so kudos to them. Doesn't mean I don't know how to play well or deserve to play less than anyone else because I didn't show up with my "own deck".