From a privacy perspective, there's no question that clarity would be be extremely desirable here. If I can speculate on how we got where we are, I would go back to the fact that the purpose of the agreement is to avoid tax evasion, and it may be that tax evasion will occur for accounts under $50,000. That's possible, so an agreement was negotiated between Canada and the U.S., and the sum total of the agreement and the Income Tax Act is unclear. From a privacy perspective, that's highly undesirable, because citizens do not know, if they have accounts totalling less than $50,000, whether their personal information will be transferred or not to the CRA and, ultimately, to the IRS. From that perspective, clarity would be extremely desirable.
Evidence of meeting #8 for Access to Information, Privacy and Ethics in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was agreement.
A video is available from Parliament.