Answer:
We have to remember that being an engineer is a very high performing job, if only a tiny aspect is ruined, the whole operation is ruined and it shuts down.
Many engineers work on one aspect of something, it could be a building or a machine. If you do not communicate with the other people, then whatever you're working on will collapse, or not get done at all.
Lets say one guy put a steel beam on one side of a wall, and another guy put a wooden plank on the other side of the wall, but all this time the wall was supposed to be made of concrete bricks.
The whole thing would just collapse and be ruined. Communication and listening to inctructions is key.