When you learn the mechanics it is very easy.

I have had way more trouble on some of if not most Bloodborne and Dark Souls bosses. Ludwig and Ebrietas were so difficult. Same with Nameless King.

In Sekiro I only had trouble with 3 bosses that took around 35 tries each. Every other single boss I killed in under 3 attempts. I went to fight the final boss of the Immortal severence ending and nearly won my first attempt. I just messed up on the shock mechanic.

So I'm convinced everyone saying this game is way too hard and needs an easy mode is just trying to play Sekiro like a souls game and dodge everything when the iframe windows are much smaller, instead of deflecting attacks.