I find this reply interesting, because as a developer I feel like #3 is pretty much the only hard thing I have to deal with: translating human intention, which is sometimes paradoxical, into code. It can be hard enough when it's your intention, it's even harder when it's someone else's, and can be a huge time sink when it's multiple someone else's. Corner cases especially, where there is no answer that can completely satisfy all the stakeholders, becomes a balancing act.