The reason is simple.. Moore inherited Garrett's "paint by numbers" approach to play calling. They have a formula for certain plays in certain down and distances against certain defensive looks and they stick to it .. Ray Lewis and his bunch were the first to tell us back in 2008 when they closed down Texas Stadium.. They knew what we were doing based on the looks they gave us and the formations we would come out in based on situations. It has been a recurring theme ever since. The only time it wasn't was 2014-2016 because in those first two seasons Romo reached the point where he would audible out of anything stupid that was sent in and get us into a play tailor made to make the defense wrong. Then in 2016 they had to run a completely different offense to fit a rookie QB. Now we still see it.. DBs standing in the exact spot our receivers are trying to get to before they ever even get out of their breaks. We seen linebackers dropping right into the passing lanes we want to throw in. On running plays defenses are in our backfield so fast at times you would think our line never got out of their stances.
I have said many times that in order for this offense to succeed against a really good defense and a really good coordinator Dak has to get to that level of command of the offense that Romo reached at the end of 2013 heading into 2014. He's not there yet. Some will chime in that he will never get there and maybe he won't. But I am not about to declare that Dak is somehow dumber than Romo. Romo took until year 10 to get to that point in his command of the offense. So Dak still has three years left. Right now there are a few DCs who are smarter than both Dak and Moore and those guys get the better of the matchup. Giving Dak a new OC should really help him against those guys. Even if the OC is not as "brilliant" as Moore.. He will be different.. and hopefully he, unlike Moore, will have a better gut for calling plays. He will attack matchups from the jump instead of playing hunt and peck against the defense early in games. If a starting DB goes out he will call a 9 route against his replacement every time. He will continue to run the ball even if it's not tearing it up because he will understand the need to stay balanced especially in a tight defensive battle where one mistake .. one tipped ball INT, one bad read, one sack fumble can lose you the game. He will be satisfied to play field position in those games.. and we will win more of them with the defense we have.
P.S. And the new OC will hopefully get rid of that damn delay draw up the middle with no one blocking the DE.