All those years of people saying Shanks' swordsmanship is a conduit for his haki honestly are getting some vindication.
I've been flamed on for saying that if you look at characters like Roger or Rayleigh or Shanks, swordsmanship really isn't the point of their strength or power. They are "classic" pirates with Cutlasses. Its not like Mihawk or other that pride on their ability to fight with Sword.
Roger just swings his blade with zero technique. It's just a method of outputting his haki. If these people "chose" to, I bet you they could throw a nasty punch at someone (i.e. like Garp).
Watch as people take offense to this comment yet again