Wrong as always.
This is what Mihawk thinks about swords.
He said, without subtlety a sword is just an iron bar. To him, even a supreme grade black blade is just an iron bar if you don't have power, strength, and skills.
A swordsman strength, power, and skills are the important thing, not the sword. Swords are just tools used to channel a swordsman power and skill through. The manga that makes that clear multiple times.
The manga stated Mihawk has greater sword skill than Shanks, not a greater sword.
Whether a character can create a black blade is determined by their strength, not the sword.
Zoro stated by the time he gets used to enma he would be much stronger. His growth from mastering enma was obtaining ACoC and overwhelming haki that he can apply to any sword.
All of Zoro's major growth post time skip are haki growth. He went from scaring Kaido and Big Mom with his haki, to scarring Kaido, to scarring King, to forcing a Gorosei to block his haki attack. They only block or evade attacks that concern them.
The only power that affected the Gorosei on Egghead Island was Joyboy level haki. Zoro forcing a Gorosei to block his haki attack says a lot about his haki strength and prove it's the user, not the sword that's important.
As you can see, sword don't give you anything. The power comes from them and they channel their power through their sword.