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JEMC said:

DARK SOULS 3 UPDATE NERFS THE DARK SWORD

http://www.pcgamer.com/dark-souls-3-update-nerfs-the-dark-sword/

A Dark Souls 3 update rolled out just ahead of the weekend has made a number of tweaks to various weapons, items, and effects in the game, including a long-awaited nerf to the Dark Sword. The official update notes say the sword now has “reduced weapon efficiency,” which the “Detailed Changes” thread on the DS3 Fextralife Wiki has broken that down to mean about a five percent loss in effectiveness.

No surprise here, once you get it (and with continuous upgrades) there's no need to change it for any other weapon till the end of the game.