"Run to set up the deep pass on play action" is super basic football, but the Cowboys hardly used play action in spite of being so run heavy. You can't seriously argue that's not a factor in their lack of deep attempts. They should be up there with the Rams in terms of almost every run faking pass and almost every pass faking run. It's just smart football.
Hell, the basic idea was smart football in 1992.
I want to see more variety on deep throws, we basically only have 2 the fly down the sideline or the double move fly down the sideline, but basically it still the same throw. I really want to see a deep post, deep corner and deep cross added, those are easier to throw and much easier for the WR to track. Makes it much easier for the WR to run under than having to track it over their shoulder or head. Those might also keep Dak from holding it too long, he can let it fly a little sooner since the WR can pick up the ball in the air a little quicker.
Also this, if you only run deep 2 patterns the QB is going to often be CORRECT to not pull the trigger downfield, because the D will always be all over it.
None of this is to say that Dak is Marino 2.0 here, just that the nature of how the Cowboys called plays stymied the deep passing game before the ball was even snapped.