If you are looking for new gameplay mechanics, tech trees, or story expansions. For that, you’d be better off looking at the New Alliances or Shattered Hope expansions. If you'd like to dive deeper into the game, let me know: Do you need a breakdown of the larger gameplay expansions ?
If you are a completionist who wants every available building or if you want your colony to have a more "official" or "grand" look. If you are looking for new gameplay mechanics,
The DLC is lightweight. It doesn't change the core mechanics—you're still managing resources, surviving radioactive fallout, and sending specialists into the world map. It simply adds a bit of flair to your home base. Is it worth it? or story expansions. For that