Because switching between a catalyst and talisman takes too much effort.
Because Wrath of the Gods is overpowered enough on its own.
Because the MLGS hits harder than a Divine Claymore, and doesn't come with that ugly, ugly scabbard.
Because the Witch Cloak looks awesome and helps hide the stupid waistcloth.
Because Great Magic Barrier makes fighting magic spammers waaaaaaaaaaaaay less annoying (especially if there's more than one).
Because Repair Powder is shiny.