Enma increase ap, dc, lethality and offers defense. That is stats. Same for other graded swords. Zoro uses swords to protect himself from attacks.
Or maybe he doesn't want Mihawk dying. :kayneshrug:
Just with the help of magic swords instead of powers of god.
Mihawk didn't defeat the most powerful swordsman in 1 vs 1 and yet he was WSS. Whitebeard or Kaidou didn't defeat WSM or WSC to defeat WSM or WSC for world to call them with such titles.
strength =/= competence. Big mom is overwhelmingly strong and yet highly incompetent. Don't overhype Stussy. No woman is competent in Oda manga. Therefore, it is surprising that Stussy got the upper hand against Lucci. The plot takes precedence over strength. Hence, Lucci was fucked up. You will...