The reason why I ask this is because, lets say for instance, a new Jedi Master makes a full 180 turn and turns into a Sith, and had been toying with the idea but had never seriously considered it until just then. Maybe the sudden reason behind the change was because they were finally won over OOC because the Sith Empire has brownies/cookies/pie/whatever-grandma-made. Now they have to wait a few weeks before they can change the tag, and it could be confusing to those not paying attention to who the person is.
Then again, this may be staffs way of deterring sudden story altering changes like so.