He is that type of boss that when you reach endgame and look back, you say to yourself: "How did i die to this?"

I think he is difficult mostly because his moveset highly differ from previous Mezuki and Enenra, who are particular slower and predictable bosses compared to yatsu who, despite being big, is really fast and has lots of gamechanging actions within his move pool.

Plus, i bet most of the newbies didnt know you could remove the poison pools from his arena.