Isn't the core principle of Swordsmanship to cut or do cutting damage?..
Nope. There is no “core principle of swordsmanship” in one piece. No panel of such a statement exists in the manga.
Flying slashes would inflict slicing damage, they are produced from the Blade..
So what? Rocks and Zoro and Ryuma produce blunt damage from their blades too
your argument is that ONLY doing blunt damage disqualifies you. so what if you only do flying slashes
we’ve established that swordsmen can do whatever they want with their swords. Flying slashes and blunt force
your fixation is on Roger supposedly only doing blunt damage, so then what about T-Bone whose entire fighting style is making Flying slashes. That’s his whole entire thing. Same way Roger supposedly only does blunt damage
also Roger doesn’t do only blunt damage for two reasons
1. We literally see Roger slashing Rocks to pieces
2. Shanks’ entire fighting style is modeled from Roger and Shanks is shown slashing through Harald