Personally I find "bus factor" to be one of the less egregious pieces of corporate jargon. It's a problem that mainly hurts the rank and file and is utterly irrelevant/invisible to management until it becomes very visible and we inevitably take the blame and eat the consequences. Learning to speak their language to communicate a very real problem is a key deliverable.

I do feel a bit ashamed of unironically using "sunset", although in my case it was more in the sense of "ride off into the ~". It was my last corp job (hopefully) ever.