Yes, even now. Dialects are most interesting. I like to simulate my own little worlds sometimes. I make a founder population and have it conquer some other areas and colonize it (like what happens in our own world all the time, just look at the Indo-Europeans, Sino-Tibetans, Austronesians, Afro-Asiatics or whoever you like). After they settle new land masses the dialects start to diverge, new customs and society are created. I like to create the languages afterwards and make small changes over time, like adding new words for plants and making city layouts, housing, etc. That's only in my human world like sims, the other ones get weird.