This is oversimplified, poppycock.
The Cowboys problem has been the same for years. They lack attention to the little details that can make a difference. It permeates the team from player selection and personnel decisions, to play selection on offense and defense, to clock management, to penalties. Dak is a product of a sloppy team that is shocked when other teams take advantage of their sloppiness.
I think the offense with Dak can be good enough. The OL has to get better or they need to adjust to help the OL protect Dak. Watch Green Bay keep 1 or two guys in to help block up the pass rush. They gave up 4 pressures all day. Love had no problem finding open receivers. When Dak has clean pockets, like Love had, he is as good as anyone. Most QB will flourish with no pressure.
The run blocking has to get better. When Dak fakes a handoff for play action, there is audible laughter from the defense. Get a defense on their heels, any defense, and the offense will have great success. The Cowboys become one dimensional and it doesn't matter who the QB is, especially when the defense knows the routes receivers will run before the play starts.
I like Mike McCarthy. He seems like a good guy. But keeping him as the HC was a big mistake. Jerry needs to find a HC whose teams are do the smart things while the opponents are fooled instead of Dallas every week.