Yes I agree Godfrey it is an important point - a threshold way of getting the terminology right, because it helps clarify that all pleasures are pleasing and in that sense desirable.
But at that point the ball is still in play. Even if Pacatus had stated his comment in terms of only pursuing natural desires, we would still have essentially the same set of problems:
What exactly are these "non- natural desires" and what should be our attitude toward them? Are we to fully banish them from our lives?
This conversation moves us along toward those issues, which I think is where the deepest issues have to be resolved.