I think they are not really suppose to be hidden recommendations. If you look at the recipe list on the lodestone, it will state some of the things that do recommend multiple treatises and yeah it would be nice to show more then one in the information menu before starting. I said it long ago but I don't think moderators look at any topics that don't get lots of constant attention. You should just be careful about any synthesis that seems like common sense to need a certain treatise but only displays a different one. (Decorated Gear = Painting, Composite Bows = Bonecarving, Stone rings = Gemcutting, Colored Materials = Dyeing, etc)