I posted the following question on math.stackexchange. Since I was asking for 'good examples' (and not just examples) I anticipated a "too broad" flag before posting. I therefore did my best to specify what kind of answers I was looking for and what I thought qualified as a good answer. Nevertheless, the question got flagged.
Since it wasn't immediately closed, I assume the community thinks it can still be improved. But how? Should I make it mathematically more rigorous what I'm looking for? Should I define what I mean by "non-trivial" more clearly, or why I would prefer some answers over others? I feel like overdoing this would be against the nature of the question. Or is the question just inherently too subjective for this site and should it be closed? But then what (SE) site does it fit on, as it's clearly about mathematics?