Playing Star Wars Jedi: Fallen Order made me appreciate Sekiro's single difficulty setting (not counting in-game modifiers like the Demon Bell / Kuro's charm), ironically enough. It's great for others that they could enjoy the game on lower difficulties, of course. But for me,
personally, it dampened my experience, since the difficultly settings weren't balanced all that well: at some point I struggled on Grandmaster from dying in 2 hits to everything, lowered it to Jedi Master, but then it was so poorly balanced that it was a complete breeze, and I eventually regretted lowering it and put it back on Grandmaster. If I had known how easy the game would be on Jedi Master I wouldn't have switched, but yeah.
It really goes to show that adding difficulty settings is absolutely not trivial dev work at all. It requires lots of fine-tuning, calibrating, and playtesting, and you gotta multiply that by however many settings you offer... And what if even on the easiest setting it's still too hard for some? Or still too easy on the hardest setting, like some games I played -- Kingdoms of Amalur, anyone?
And that's not even considering how complicated it gets when you involve online multiplayer (which Sekiro doesn't, no, but Souls games definitely will, as will Elden Ring).
So yeah, it's not that simple, and if FromSoft wants to continue doing their thing and spend their dev resources to polish up their game in other areas, instead of spending it implementing various difficulty settings, then personally, I'm all for FromSoft doing what they do best. ^^
Personal hot take but I'll throw it around regardless: for how combat is designed in Sekiro, a traditional difficulty selector wouldn't do much good for those who struggle. The game requires you to engage with combat in a very specific way and dying in 4 hits instead of 2 wouldn't alleviate the problem. It would require a much more serious overhaul, lot of testing and work. I'm happy if the devs want to do it, but resources are limited. At some point I'd personally rather have more/better content. It's a selfish decision though and I'm totally ok with people disagreeing about this one.
Nah I'm with you. I don't think it's any more selfish than those demanding alternate settings. People want what they want, you can never please everyone and that's OK.