King of puppets and the rabbit brotherhood were the only bosses that gave me a lot of trouble. Laxasia being kind of hard, this games melania. Final boss I didn't have too much issue with.
Just finished my run. Only had difficulty with 3 bosses in the game, including the last one. By the time I was grinding against the last guy I decided to move on. Chose the weak/wrong ending and moved on to the next thing in my backlog.
It never clicked for me like Sekiro did. I felt a lot of things were not telegraphed enough to react and relied on memorization. Though I probably didn't go deep enough into combat.