I don't really mean problems that are unrealistic, just ones that are not everyday issues. Along with that, I think "provably correct answers" are mostly good,

I don't really mean problems that are unrealistic, just ones that are not everyday issues. Along with that, I think "provably correct answers" are mostly good, but it does not have to be just a single possible answer. I think the best problems are the ones with multiple good avenues, but you can still objectively identify if they take a wrong turn along the way.