How Absurd Is A 40 Yard Dash Time?

How is it an accurate measure? It doesn't relate to football speed. It's an indicator, but not exact in any way. Furthermore, it doesn't relate to the type of athlete you are. A smoother athlete can probably get away with not having as much pure speed. And finally, it's not a track meet. Every game I've ever watched has had the players in pads and a helmet, not in track shoes & speedo's on a track. The equipment players use adds 10-20 pounds to their frame. The better question would be, how fast are you with all of that on.