It's not just the existence of warp points, it is the basic premis of building an empire in space.
That has nothing to do with how Proportions is not really any more realistic than the normal game. Some things may appear more realistic with how you have changed them, but they are still not realistic. Populations do not just grow at a constant rate and then stop at some arbitrary point. Even when Proportions slows down the rate of growth, there is still the same unrealistic model of population growth as in the normal game.