Finally started Nioh 2 this week. This game is....involved. Even within the first few levels, I have multiples of several different weapons, armor, and special abilities (I believed called soul cores) all with different levels and special effects. There's a different skill tree for each weapon, ninja skills, transformed skills. Different attributes to level up. I just unlocked the blacksmith and now I can I guess combine different stuff together to level up all the weapons/armor/soul cores, switch out the special effects, break it down into materials? It's all very RPG-y. I guess people like putting together their build, but the reason Sekiro is my favorite game is because of how streamlined all this stuff is. A basic skill tree and a basic prosthetic arts tree and that's it. You spend more time actually playing than staring at menu screens overwhelmed.
The combat though is very good. Level design is OK, too, but seems a little more video game-y than FromSoft. I'm going to stick with it, but I hope this stuff doesn't reallllly matter and I can get through it without having to research how to optimize my build.