Thanks!
Personally, I kinda like those times when you manage to fully contain the humans, and are left to fill the remaining tiles by yourself. For me, on that moment the game kinda turns into a "sandbox" in which I can focus on creating an aesthetically pleasing map. Though I don't know if that side-feature will be appreciated by all types of players.
Perhaps, I could offer the option to skip that process for players that don't really care about that, and are only in it for the puzzle/strategy aspect of it.
What do you think?