There have been numerous situations in my career as a Product Manager where I’ve come into a project or product that’s so established and critical to client success that there’s a strong hesitancy on the part of anyone to dig in and muck with what’s “working”, even if it’s not really “working” in the eyes of the customer or user. This is, sadly, the fate of many B2B applications that have been in place for more than 5 years or so — B2B systems tend to be designed to meet specific goals and specific purposes, then have additional capabilities “bolted on” afterward, with little or no attention paid to how everything works together or what the overall user experience is.
And, what you wind up with in those cases is a runaway bus that needs to have the engine tuned, the wheels changed, the outside painted, and the upholstery redone — all while the bus remains in transit, and while it’s entirely full of passengers.