In Football practice team members discuss and demonstrate their moves in various scenarios. They don’t just agree when to pass the ball.
Integration is similar in that it’s not a translation from a source to a destination.
It is an understanding of what each participant does and is likely to do with the shared information.
Restricting this to data field exchange is similar to agreeing when to pass a ball: It assumes no one will vary the scenarios.
In a world where computers are undisputedly productivity tools, we can’t slow down productivity improvements either via monolithic applications or by applying unsophisticated integration. We need teamwork.