- The lowest form of coupling is set of disconnected objects, which couldn't form a system. (Since, objects don't interact with each other.)
- The highest form of coupling is Inheritance, which is one of the pillars of OOPS.
The answer for this irony can be "everything is a trade-off in software development". Principles are only guidelines and not rules.
An Anology: "Drive Slowly" is a common driving safety guideline. At the slowest speed (0 km/hr), the vehicle doesn't move. Also, people generally wants to buy a vehicle which gives maximum power and speed. Its a guideline to be applied pragmatically.