I think that's why. Presently every station has its own division assigned to it. Again, if there are different stations with different divisions, this ensures that this information is available, whereas under the new requirement, we're not certain that the information will be available.
Evidence of meeting #124 for Procedure and House Affairs in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was election.
A recording is available from Parliament.