Just watched the movie, and it did make the rest of the world somewhat more engaging by giving the characters more screen time and development. For some reason, I thought it involved the grown up version of that martial artist's kid (being enrolled at Jujutsu high), and was waiting for that the entire time, but that's not a big deal; just backstory on what could have been another protagonist.
Why? Villains having more than one dimension - being the hero of their own story - is leagues more interesting than being insane, plain evil, or mustache twirling caricatures. You wouldn't say the same about the Spiders in HxH, would you? Opposing philosophies, circumstances and broad misunderstandings make deeper, richer conflicts in stories. Is the problem that you are afraid someone will mistake the bad guys for the good guys or something?