real life example: there are comments in code I've seen that are like "don't delete this or it breaks X" but there is no X, no mention of what X does in any C

real life example: there are comments in code I've seen that are like "don't delete this or it breaks X" but there is no X, no mention of what X does in any Confluence page, and deleting it borks stuff badly. asking around and no one is sure what X is or does, and short of refactoring the code, no one has bothered to get rid of it. a simple question of "wtf is X?" turns into multiple meetings, failed QA tests, general custerfuckery, all of which have a $$$ cost in hours wasted. the people that knew are gone and DGAF, but would happily consult for a heafty fee.