The depth of the book cannot be overstated. Everything has a backstory. Answers for questions are often sprinkled around in conversations spread throughout all the books. Tolkien spent years working on the Silmarillion before starting this which is why so much detail is sprinkled throughout.
And Tolkien was crazy detailed with everything. He plotted every step of the journey out on a map and ensured everything, including the phase of the moon, was kept consistent.
I assumed it was intentional.