Some shows are born great. Some achieve greatness. Peaky Blinders did something rarer: it arrived fully formed, ascended to an almost unreachable peak, held there just long enough to feel mythic, and then descended with the slow, sad inevitability of a man who has survived too many bullets and started to believe his own legend. The arc of Peaky Blinders is, in its own way, a perfect parable about what happens when a story stops being about something and starts being about its own continuation.