Let's turn that around and say that we won't give the responsibility to the Governor in Council and we'll leave Parliament to do it. The way the government is run, if a majority government decides to appoint another person, and puts a bill before the House, and doesn't add the person to the list, we will end up with a person who will not be bilingual. That would be more possible than having it done through this bill here and the Governor in Council having the responsibility to put it on the list.
Evidence of meeting #73 for Official Languages in the 41st Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was positions.
A video is available from Parliament.