Not a big fan of Simms but every time I watch more video of the Cowboys offnese it looks to me like DBs know where our receivers are going. They seem to diagnose the play faster than Dak sees the defense. So there may be something to the idea that the offense is too basic.
I think Simms is right that the Cowboys passing game look shorter than in the past. It is hard to say if that is Dak checking down or all play design, but against SF they threw deep at least 5 times that I recall and Dak only threw 24 passes. So 5 deep balls was a good percentage.
Overall, I thought the game plan was bad. SF has two really good LBs and running left and right is not going to work well against them. The Cowboys were getting more yards running right at the LBs, not crazy yards, but not losses either. Running at the middle of the defense negates their speed to the outside the way SF ran at Micah taking away his speed in pursuit.