Board Thread:Questions and Answers/@comment-173.35.58.104-20170623050355/@comment-3215051-20170623053621

It allows you to switch between the weapons and it was primarily for when Demon Raid/War Chronicle weapon boosters were a thing. You can switch the weapon without overwriting whatever you use in normal questing. I honestly don't see much use in it nowadays other than for Abyssal Vortex weapons though. [Kodachi]