I'll start again, and then perhaps my colleague will want to add to that.
When I approach this question, it's more from a trade negotiator perspective. As a trade negotiator, I like to have all of the tools in my tool box, as it were. I like to have everything at my disposal, even though in the back of my mind I know what I can and cannot do.
When I launch the negotiations, I want to be able to have as wide a discussion as possible, knowing that as we approach the finalized agreement, it will be much narrower.