There are two main benefits, I think. The first is that this is a very efficient process for amending tax treaties. This is the first time that the OECD or other countries have done this. Traditionally, Canada does all our negotiations on a bilateral basis. To amend over 70 of our tax treaties would likely take a decade just as a practical matter because it's a very slow process to amend bilateral treaties.
On February 7th, 2019. See this statement in context.