Miyazaki has the right to set whatever difficulty he wants. My complaint is less with FromSoft. I've resigned myself to the fact that they'll never release a game with difficulty that is accessible to everybody. My complaint is more with the community, who sees any discussion of "hey the monster design and lore and scenery look cool but I can't get past the Asylum Demon" as some sort of threat and responds with vitriol. The discussion here has been largely positive but even here I've got somebody who decided to just respond "git gud." You can imagine how it goes on reddit or twitter.