The practical benefit is to reduce your process to a single step.
There is also the possibility that the default can be automatically set to country in some parts of the world, where it makes sense, and/or that the default level can be made “sticky” if it’s changed. Either one would get you a list of the top ten Mexican identifiers on every observation page.
Whether we get that or not depends on how much effort the developer(s) can spare for this one feature request, but it’s at least possible, and possibly probable. :-)