Design Debt is not a new concept. It is a common cause of product failure. Taken from the link above:
"'Design debt' explains the problem. When a team is working under pressure, they take shortcuts that compromise design quality. It's like taking out a high-interest loan. The team gets a short-term boost in speed, but from that point forward, changes are more expensive: they're paying interest on the loan. The only way to stop paying interest is to pay back the loan's principle and fix the design shortcuts."