"Very limited uses"?!? Ho-ho-ho, ha-ha-ha, that's a good one. You just haven't been hanging around the right ethnic groups. In Eastern Europe buckwheat is known as kasha and is cooked and served the same way as rice. Here's a Polish recipe for curried buckwheat with
mushrooms, onions, and red pepper:
Don't worry if you don't understand the world's fastest Polish speaker, this is one you can just watch and repeat.
And here is a Japanese chef making soba noodles from buckwheat flour. He even speaks English!