The issue is that difficulty should automatically scale down once better gear becomes available, like Legion, or ADL, once Adoulin gear came out they became much easier. The reason NNI didn't is because they based the event on a stupid gimmick of luck making the floor jumps random the way they did, which made it stupid, and doesn't allow it to scale automatically, rather, they would have to go in and do it by altering the event itself. Another reason why stupid luck based events like it are a horrible idea, and are of a bad design.