The Tonfa dojo fight is absolutely absurd, he uses the charge up attack where you rush forward. For you it takes a few seconds to charge and if you get hit you get knocked out of it.
His doesnt require any charging and he can use it while you are attacking him, and it does like 90% of my HP in one hit. Absolutely ridiculous
He also breaks your Ki in like 2 normal hits while you are guarding, what the fuck
One of my only problems with this game is that it relies heavily on "your rules aren't my rules" and other underhanded means to create challenge.
Why are those Saika riflemen able to shoot twice in quick succession? Why is Koroku, half yokai, allowed to launch lengthy combos even when his Ki is broken whereas the protagonist, also half yokai, is winded like a regular human on a Ki break? Why is everyone and their pet rabbit able to initiate burst attacks,
except the protagonist?
As for other underhanded means, take the "The Brothers' Blades" sidemission. You fight Magara Naotaka again, and if you don't break a crystal you will be ambushed by a revenant as the former's health gets low. However, nothing indicates this will happen. You are allowed to go straight to the boss and while such generosity is suspicious, there's not a single thing leading up to the boss that says: hey, maybe you want to take care of that suspicious crystal first. Hell, you can't even see the crystal in the first place, which means you can't account for its presence.
In "A Shadow's Duty" I wanted to run to the 'boss', a Namahage, with Catwalking and Sneak Thief scrolls. Everything went fine until I arrived at the Namahage and the Gaki sitting on top of the arch was arbitrarily able to see through my stealth, instantly jumped me and eat 75% of my health. From now on I'll assume any enemy trying to ambush you is immune to these scrolls. But there is no way I could have known this beforehand. I've run past plenty of Gaki before and there wasn't a single indicator it wouldn't work on this particular Gaki. And it's just super frustrating, because you get punished for something you couldn't have predicted.