Whenever your product is in for the long run. For those cases, better temporarily break it than eventually being unable to manage it at all. That line of code

Whenever your product is in for the long run. For those cases, better temporarily break it than eventually being unable to manage it at all. That line of code no one understand is a technical debt. Sometimes, it is better to pay the debt right now. I'm currently working on a 2 millions LOC program which never paid its dammed debts, and I weep every day before this holly Big Ball of Mud.