You make a god point about the generally accepted meanings for terms for technical debt. However, there are lots of companies ive worked in (and more I know of) that try to scientifically calculate a numerical value for Technical Debt. At best, it's a metaphor, a mental aid to understand a loose concept. Any attempt to calculate implies that there is some 'best solution' that should be achieved. However, this almost never exists, any best solution is in the eye of the beholder, it will differ depending on whether you are a developer, DevOps, client, manager, CISO, barista, best friend, pet.........