Actually there can be rushing if someone starts out close to you. Sometimes even on big maps, if you are unlucky enough to be 2-3 jumps from someone....kind of aggressive. I may have been guilty of this once or twice.
One time on a huge single star random map, there was a phase line directly from my homeworld to an enemies. Good times.
If you hate rushing, you can find some maps that make it very hard, or impossible.