I cannot believe the amount of anons trying to defend the replayability of this game and not finding the right words.

Why should you replay Sekiro? It's obvious. You unlock a new perspective of the game, you are the wolf now, you know everything about the enemies, their attacks, the maps... You move like a shadow.
By the time you finish the game for the first time you've fought Genichiro so many times you know him like the palm of your hand.
And when you start a NG+ who's the first one to greet you? Genichiro, and you beat the fuck out him this time around. And that's when it all makes sense.