I have to be honest - I don't particularly like it, nor do I think it is necessary. It tends to give the member who is made the assistant the idea that they are above the other members, when it actuality, they are ranked no higher than any other entry-level employee. The other members treat them as if they are equivalent to a division head, when they are not.

Not to mention, there is simply no NEED for an assistant. If your character IC needs some help with something, use your division heads or ask another member to perform a task. Most of them are looking for something to do anyway.