I finally did it!! For all of you who thought I couldn't!
For context, I'm the guy who made these posts in the past:
Stuck in Lone Shadow: https://www.reddit.com/r/Sekiro/s/wfClA1HbTv
Stuck in Genichiro: https://www.reddit.com/r/Sekiro/s/BrQsf7pBfd
Stuck in Guardian Ape: https://www.reddit.com/r/Sekiro/s/lYV7Y5Pi6V
This game at first just felt like it kept throwing bullshit after bullshit for the sake of just making almost impossible to get through, but at some point I somehow just wasn't struggling with the combat anymore and I couldn't stop enjoying this game. It took me 90 hours, but I got to the final boss, and after about 4 hours of attempting, I just beat him, and it felt amazing, 10/10 fight, and great game.