Aeralik:
The point of this change is much like the item swapping while in combat change. We cannot properly balance around swapping some items to maximize buffs and then once those are cast switch to a dps configuration. If you want the effect from an item you should be using that item not just equipping it to buff.
Being disarmed isnt that difficult to catch so its not necessarily an issue. There are however several other unforseen issues I am seeing so I going to pull it from this update but expect it to return in a future update.
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Comes later then

Enjoy buffing as long as it is poss

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Chillispike, 80 SK, a Boogie Godfather (a Guildleader) of Boogie Knights
Sanji, 80 Coercer, Guildleader of Unity