You do know that nioh actually has a higher skill ceiling than sekiro because there's more combat depth? That doesn't have to do with difficulty.
Only boss I had trouble with in Nioh was the last one because it was so poorly designed. Once you learn the sysyem the game is cake, and the ceiling is negligible because the game is beatable without reaching it. Whereaways souls games while not overloading you with superflous systems still maintain tight solid gameplay.
This is purely on combat, if we bring up graphics, lore, aesthetic, etc it is an utter wash. Aint no epic shyt in Nioh on the level of even like the fukking Cleric Beast lol. Nioh being compared to these games is a joke tbh
It does have better gameplay than Sekiro tho. I legit didnt get why peiple liked that one. I thought it was middddd