There are certainly different ways you could think about it. I think the idea is that the work plan is meant to be a collective endeavour between the PBO and parliamentarians. The Speakers were chosen because the role of the Speakers is actually to facilitate the business of Parliament. Looking at their roles, their roles are to facilitate Parliament. It's not to somehow restrict the PBO. It's meant to facilitate the business of Parliament, and it's intended they do it in a non-partisan way. That's the thinking behind what's proposed in the legislation.
On May 11th, 2017. See this statement in context.