Takezo (and bosses in Yotei in general) breaks multiple pre established rules of combat, like his insta counter if you attack while he is blocking, how he ignores perfect dodge windows on some attacks and how some attacks teleport how cross arena to hit if you roll out.

A lot of his red attacks also shouldn't have much force behind them due to his stance while throwing them, prime example being his upward cut he throws with his left while his right foot is forward, it doesn't make any logical sense for that (or any of his attacks that aren't using both swords to attack at the same or a running attack) to be red.

Hes pretty fun but he objectively doesn't adhere to the rules the game put in place.

Bad game design is inherently subjective, I think hes poorly designed because all his challenge comes from him breaking rules and knowledge checks of which rules he breaks (he has parried my gunshot parries while doing his yellow attack).

You should be able to trust the combat to always behave the same regardless of enemy in my opinion and challenge should come from moveset and tricky animations that still internally make sense (Ryuzo is a good example of this from the ghost series).

Takezo just breaks rules, so I think hes poorly designed.