I don't think the requirement to submit a work plan or to have a work plan was the issue. The issue was why do the two Speakers need to approve? For starters, you have a Speaker of the Senate who is elected by no one. Then the other concern that was expressed by both former and current parliamentary budget officers was that, as you get close to an election, you've got a Speaker who, while he or she is deemed to be in an independent position, is also part of a political party. You could very well have situations in which that Speaker would not approve a work plan that in some ways might be detrimental to his or her party in the upcoming election campaign.
Is there not a better manner of approving the work plan than having the Speakers approve it, i.e. maybe a House committee, or something?