If every team could throw the ball 60 times a game effectively, they would.
Brady/Edleman/Gronk are an unorthodox trio, to say the least.
I think you're being hasty calling it a "weakness." Roman calls a risk-aversed, QB friendly offense. At least he has. But he's also always had developmental guys.
One of the following his true:
Taylor is unable to go over the middle Taylor is unwilling to go over the middle Roman doesn't run routes over the middle.
I'm not so bold as to sign off on a single one of these (sound familiar, Rex haters?).
Why? Because:
Taylor is a running threat, so teams station a guy in the short center field to spy him. When they mixed/opened it up in week 17 for Sammy, they did A LOT of stuff over the middle with success. When he did go over the middle in other times (think game-winning strike to Clay (x 2 (he dropped one of them)) against Houston, he HAS been successful
Given these factors, I think it's wrong to say TT "can't" go over the middle. Or is "weak" over the middle.