It hearkens back to the departmental design. In the good old days, Immigration and HRSDC were one and the same shop. What they've done is they've pulled out the baby and left the umbilical cord attached to the mother. Well, if that's the situation, you have to, by regulation, ensure that it's one package in order for everything to work properly.
On November 19th, 2013. See this statement in context.