Edit: Gosh, MiC sure is disgusting with all of it's reprinted versions of actually nice stuff.
To be fair, everyone complained it was broken to begin with. When they made their update they made a lot of items cheaper, and yes nerfed a few things as well as buffed a few things, in an attempt to increase availability. A cheaper, less broken, amulet is probably more likely to see tabletop play.
We just happen to be inherently slanted towards hating nerfs, but again Osl could allow it. Using powerful items is a quick way to bring improvement without having to change anything too which could be a nice way to quickly buff Kat. Plus it's unique, no one else in the party has gone that route.