A colleague of mine is developing an internal tool nobody needs in a large IT corporation. Since it's not client facing, there's no rush from project managers. It's dragged on so long that other internal tools have already implemented most of the needed functionality - so there's no good value proposition now. The only argument keeping it alive is sunk cost fallacy. Colleague works minimal required 3 day weeks, spends maybe 2 hours in the office drinking coffee, and tells me how he enjoys life with lots of hikes and outdoor activities.