Sekiro is for everyone to play.
I am pretty sure if From Soft made the gameplay accessible someone definitely would say “From Soft needs to respect its players and give more cutscenes To Explain The Story”.
Just because someone can see everything an art form has to offer doesn’t mean they understand it. A movie like Shutter Island, an anime like Evangelion, a book like The Alchemist, obviously everyone can see/read them, but not everyone can understand the. Gaming is a totally different kind of medium which requires mechanical and mental skill to progress.