I wonder about the angle of the article, starting with "B-Trees stand the test of time" ending with "everything else has seriously diminishing returns". I neve

I wonder about the angle of the article, starting with "B-Trees stand the test of time" ending with "everything else has seriously diminishing returns". I never ask myself why we still use hashmaps or heaps or whatnot, so makes me wonder if this is really an article about why Cedar does not use something else? (LSM-trees the elephant in the room?)