Pretty sure this is part of the "challenge" of completing the new stage and fully intentional. The devs have all but come out, /point /laugh and said "You know you guys who did the earlier stages in a day then bitched about how easy it was after all the hard work we put into it? Well, that hurt our feelings, so HERE! /evillaugh" XD < This is the impression I get from the devs in FP35 when it comes up. lol
Ranged RMEA weapons/ammo were balanced/added together to hit whatever targets the devs wanted, katanas were balanced individually. New ones might be nice, but don't get your hopes up for RMEA level performance since the devs really don't seem to like this idea.