There is a popular myth that in order to protect its metalwork from the salty ravages of the nearby North Sea, the Forth Bridge needed to be painted to keep it proofed against corrosion. The task took so long that, by the time the painters finished one job, it was immediately time to begin over.

A product manager who thinks they’ve got an easy ride because their product is a cash cow is probably missing the point. While failing or unpopular products have a more obvious set of problems to tackle, successful ones have a different set of arguably trickier problems