It’s a major deviation in difficulty definitions between fromsoft and difficulty sliders — the usual increase in difficulty is to just bump the stats, which typically just means you have to play perfectly for longer durations.
Fromsoft just asks you to play perfectly for a minute, maybe two (and honestly not that perfectly).
Eg I’m playing triangle strategy atm, and the hard mode difficulty bumps their stats so high that the strategy ultimately devolves into some kind of cheesing in many cases (and then spend 15 minutes executing that cheese because the enemies are taking chip damage). At the same time, normal mode (apparently) is easy enough to just plow through, so I’m pretty much stuck if I want an actual challenge — and that’s hardly a surprising state of affairs.
I spent several days on O&S. Two hours would have been fun and I would have felt a sense of accomplishment. In the end, I cheesed it by pinning Smough to the broken pillars.