Well, clearly they want a starting move for Rowlet, something it can have at level 5 (just like all the starters had in generation VI), and just as clearly Razor Leaf is too strong for that. It could easily learn Razor Leaf later on. Is Vine Whip appropriate for Rowlet? Eh. Doesn’t strike me as a great match. We’ve never had a bird-like Grass-type before, so new moves that go along with that strike me as nothing more than we should expect.