> On SO, it's often best if questions are somewhat version agnostic, and different answers address different questions.

Yep, this is their 'way' but what I think @fragmede is getting at is, how can you know your question will be redundant next week. I prefer the 'duplicate' idea, where the user actually links the old question and says "hey this didn't work because X Y Z", then (in most cases) people will engage with the question as it demonstrates a level of effort.