It didn't impact me too much because I never really evolve my Pokemon anyway and I would have been way too attached to them to make them evolve haha. However I think it would have been cool to be able to evolve a little earlier for people would like to. It's pretty mean making two basic Pokemon take on crazy legends. xD I know I wanted to use a Vaporeon in the main story once and it sucked that I couldn't evolve Eevee until afterwards. It might have made the game too easy though...