First, it wouldn't change the fact that substituting members have privileges. They'd be considered members of the committee.
Second, in the event that the government decided that it was worthwhile to have the parliamentary secretary participate in a committee meeting, especially if we were talking about a particular study and we wanted to make sure that we had the calendar of the minister and availability of the minister to appear, maybe on estimates or supplementary estimates, which is often information that the parliamentary secretary is aware of, we may want to have him attend our meeting. This would also provide us with the ability to do that, so it does provide greater certainty in how we manage our affairs.