Along with this it has an amazing soundtrack. Composed by Ramin Djawadi, the same person behind the OSTs of Game of Thrones (now House of the Dragons), Westworld, Pacific Rim and others. Extremely talented and one of my favorite musicians.

I remember that I quit watching the show, some where in season 2 I think, because of the repetitive theme you just described, but I'm glad I stuck through. One of my favorite shows and favorite soundtracks to date; still listen to the Root themes from time to time.