Well think of it this way, a developer knows how the mechanic works and looks at their initial UI. They think it is enough information not knowing that his prior knowledge is filling in the gaps.
Tester comes in, plays the game and then delivers his feedback saying that they would like to have this mechanic explained better in-game, perhaps by having a little more information in the UI.
I do agree that CA can miss out on a lot of smaller details, this delay will undoubtedly be good for the game as a whole.