Suit is automatic power-up like power ranger suit. Zoro just switched swords. Plus he had to train the sword.
That's why so many fighting sports allow to use edge weapons in a fight. Because fists > swords.
And you need to have above 1 IQ to know not to cut yourself but cut your opponent, and that's pretty hard to achieve for swordbois.
You need endless training to achieve that 1 iq point