@BabyPyroshark
I don't think this is about karate being the end-all-be-all. This is just a about someone who's devoted his life to something, to the point that other's (rightly) think he's idiotic.
It's not that karate is the strongest/ultimate.
Just that the karate idiot is the strongest.
Like you said, it could have been any martial art. But karate is familiar to a wider target audience. It's a japanese manga.
Who the heck knows what glima or HEMA is unless you've already researched it?
And personally, I haven't seen a lot of karate isekai. I've seen a ton of swordmaster isekai tho, and feel like
that is much more severely overdone.
Maybe some FMA espada y daga or something instead, idk
My point is that katana being "the ultimate cutting weapon" has been done to death and im tired of it