I reached the "Shura" ending in Sekiro. I was already aware that this was an option, so I knew what to expect once I chose the dialogue option that locked me into it.
Something I appreciate about Sekiro from a general game design perspective is that it gives you two options for approaching tough encounters: You can learn the encounter front-to-back and go with the flow of the fight, or you can take control of the fight yourself. It's a satisfying game to learn, and the feeling of "oh my god I finally did it" when you take down a boss is a real joy.
I'm going to try to get the other endings soon.