I'm really speaking to the offense. The defense doesn't have enough quality personnel to matter. Often they are playing technically sound but just can't get it done due to their own limitations.
On the offensive side though, I 100% think that it is on the coaching. A hold here and there has not been our problem. We don't miss many FGs. Romo throwing INTs to DBs because the WR didn't run the right route, not finding the hot read on an OBVIOUS blitz, too many line adjustments, missed assignments, etc. is coaching. The offense just does not have a culture of execution. It wants to run hundreds of plays/routes and adjust on the fly to what the defense presents. THat requires a TON of recognition by the QB, WRs, OL, it requires tons of chemistry, and you have to be right. At some point, you have to simplify it and allow the players to just execute on something they have practiced over and over and over.
Again, I think that is perception, not reality. When you look at the 8 losses -
KC - Dropped pass late that could have changed the outcome - Player execution
SD - Lots of dropped passes in that game - player execution
DEN - Pick at the end - Player execution
Lions - Hold that allowed the clock to stop and the D just sucking in the last 60 seconds - Player execution
Saints - Beat down - Put that on the Coaches
Bears - Beat Down - Again Coaches
Packers - Bad game management by Garrett all the way on this one. D sucked bad in the 2nd half though
Eagles - INT to end game - player execution
So in my mind, the players didn't execute in 5 of the 8 losses. Each game has it ups and downs, Momentum shifts and close calls. The job of the coach is to have your team in a position to win at the end of the game, whether players have made mistakes or coaches made the mistakes, don't really matter during the game. The only thing a coach really focus's on during the game is winning it. in 6 of the 8 losses, we had a chance to win at the end and the players didn't make the play. Hard to really hold a coach accountable for a top 5 WR dropping a pass in crunch time or your franchise QB throwing a pick in the last 2 minutes, or your Best OL holding on a crucial play. That is all on the players. We can go back and forth on whether the coaches called the right plays or the timeouts correctly or whatever, but in the end, players have to make plays and our stars just don't and I am not going to say that is coaching.