While I agree with you on the basis of not wanting the full weight of players on the quarterback, I’m gonna have to strongly disagree with your assessment that he could have “rolled to the side”.
Being able to stop, and even change your momentum while running as fast as Matthews was is very difficult to do. You’re essentially expecting him to start doing a barrel roll in mid air WHILE his arms are wrapped around Alex Smith who weighs 200+ pounds. I’m sorry, but the physics involved in this action are extremely unrealistic in such a fast paced game and bordering on impossible. It’s just silly.