What other conclusion is there when you say that the reason this team hasn't gone further in the playoffs is due to the fact the players didn't properly execute the plays called by the coaching staff?
What's really laughable is your attempt to minimize the argument against Garett to them missing the playoffs, as if that's a rarity under him. You are talking about a coach that has 7 full seasons under his belt and only two playoffs appearances and only one playoff win. But yeah, the irrational position is the one where the head coach (and GM) bears a heavy amount of responsibility for the multiple failures of that 7 year run.
And note, I never said the players bear no culpability. But in the end, this isn't some small sample here. We now have a pretty strong track record of the GM's failures (22 years) and the head coach's (7 years). And I am a firm believer that, yes, failures to execute game plans are also, at least partly, the responsibility of the coaching staff. It's why the Rams look inept under Fisher and in one year with a new staff they look like a different team. Competent coaching shows itself not only in the game plans and in game decisions made, but in how a team performs, executes, applies the fundamentals, etc.
What happens if they miss the playoffs again in 2018? Is there a point where we say, you know what, the coach isn't good enough (the GM isn't ever changing, unfortunately).
Repeating your brilliance does not make it any more thought provoking. What do you not understand about the meaning of the word, "hindsight". They can say anything they want to after the fact but where is the tape of them saying this is what Dallas is going to do, before the game was played? There isn't any because they didn't know jack, Jack. The post game interviews were pure hindsight.
