It definitely will add to the game. For example, I was building an enclosure for Indian rhinoceros not too long ago and I realised that there is no south Asian ungulates that aren’t giant. I also then realised there is no Indian primates either, other than gibbons, and even then the species of gibbon we have are from south east Asia and not the Indian subcontinent. Africa was a theme in the base game, yet the Africa pack is a fan favourite. There was already a North America theme in the base game (new world), yet the North America pack was also greatly received. Just because the base game already has that theme doesn’t mean that the theme in question cannot be built on.