Players have to execute. You can study the film, which all coaches do. You can develop the perfect game plan. You can coach/train your personnel to execute that game plan.

Then the game happens.

The opponent is executing their plan and our players theirs. And often, one side just beats the other. Period.

so all this whining and moaning about an OC being predictable, or whatever is just a bunch of fans trying to make themselves feel better. It's also funny. Because they all think they know better, yet none of them are making a living teaching it.