Agreed about the butter, very important! That's why the recipe mentions "paint the crêpe with butter".
This is a family recipe carried over generations from the Pays du Léon. There are many sub regions in Brittany so I would not be surprised if your family's recipe differs.
The other part of my family comes from Rennes, where galettes (buckwheat crêpes) come from. There are also many recipes for the batter of galettes.
In other words: please try my family's recipe! My grandmother who just passed away would have loved to hear what you think :) (she must have made thousands of them along her life!)