Why not just have 1 tag or 3 tags? Or have 10, 20 or 30?
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I think it was to prevent under-categorizing and over-categorizing. With less than 5 tags your hurting its visibility for the subject. I can ask a question that encompass
More than 5 and most questions end up being shotgun tagged to abuse its visibility. Many times on SO I see questions tagged with the top 5 most discussed languages when they really only vaguely talk about them (and a
So why 5? Because it strikes a nice balance.