Says who? Give me a single manga panel or official source or anything in 20+ years of history of One Piece which says that?
There's an official source which calls a blasting technique swordsmanship. You can disagree, but it got a lot of backing by Oda than you or me and it has nothing which contradicts it.
There's not a single instance in entire manga history which says swordsmanship is limited only to cutting.
The peak of swordsmanship is apparently "cutting only when you want to" and having "slashes that cut nothing", as well. As proven in Alabasta.
I think better continue the discussion here
Says who? Give me a single manga panel or official source or anything in 20+ years of history of One Piece which says that?
All swordsmen like Zoro and Mihawk focus on cutting things, Zoro lives to cut everything he wants, Mihawk lives cutting icebergs, cutting ships and all his skills are based on cutting.
So it's only fair to say that in OP criteria, slashing skills are swordsmanship skills.
Also because it is very dumb and lame to associate meteors, fire dragons, meteors and CoC blasts are part of swordsmanship skills.
There's an official source which calls a blasting technique swordsmanship. You can disagree, but it got a lot of backing by Oda than you or me and it has nothing which contradicts it.
Which one are you talking about? Are you still in the shit over the Ikoku discussion?
Let's do the following, if this non-canonical information is that important to you, what does tell me about databook saying that Vista has fencing skills equal or greater than Mihawk?
There's not a single instance in entire manga history which says swordsmanship is limited only to cutting.
Something extremely obvious doesn't need to be said. It's like saying that a character with Black Leg Style needs to use kicks to attack. There is no ambiguity for something so obvious to be revealed.
The peak of swordsmanship is apparently "cutting only when you want to" and having "slashes that cut nothing", as well. As proven in Alabasta.
And that's precisely a technique to cut tougher things