Especially if you're predictable with the kind of route combinations you run out of certain formations. The defense can go to a presnap alignment that dictates where the ball should be going and then rotate to a coverage designed to take away certain route combinations.
I don't think there's anything wrong with progression read. The article makes it sound like it's some antiquated part of football, like run blocking tight ends or the Pro Set. Progression read is imo the right strategy when your receivers are all at about the same skill level and have about the same skills. Look at Green Bay, especially when they had Greg Jennings, James Jones and Jordy Nelson. All of those guys do about the same things well. You can line them up anywhere and run the same route combinations (though iirc the Packers were no more flexible with their outside/slot designations than we are). So why not use a progression read system and go to the guy who's the most open?
The Dolphins don't have that kind of receiving core. Hartline and Wallace do completely different things well, as does Matthews. That creates a kind of predictability which progression read hopes to avoid (since the defense is willing to let you do things you do poorly, obviously). With Wallace in particular, you have to be willing to take your shot when the defense gives you a certain alignment. Going deep is the only thing he does well. If you're not willing to maximize the talent he does have, then just get rid of him.
