battlefield has always been a deeper more mature experience, saying so isn't bragging. Most people don't want a deeper more mature experience because that makes the game harder. For a game to be successful it has to be easy so players will buy it. Now COD has a lot of skilled players, and playing against them is hard, but so dose battlefield. What makes battlefield more challenging is the need to co operate to succeeds. COD is about aiming, battlefield is about coordinated movement over a large environment. This takes good squad leaders and patience. while COD takes fast reflexes and pixel perfect aiming.
What Dice is saying is they are not going to take sales away from COD by trying to mimic them but only better. Dice will make Battlefield into the game they have always made, only better. Now if COD added vehicles and squad leaders and generals essentially changing there game to resemble Battlefield. They would be competing in the same metaphorical sport. But I can't see either developer dumbing down, or sophisticating there product, they already have established clients who are dedicated to the styles which each is famous for.
And yes COD is a less sophisticated, twitchy, fast past action game, but so what. That doesn't make it bad, its the best twitchy action game franchise on the market. And Dice is there for when we want more depth. Because Shooting dudes just to shoot them just gets boring, and I need to capture a flag once and a while.
And finally neither game can legitimacy claim to be a military sim there both arcady action shooters compared with Project reality, or Arma games.