Consider this scenario: you and your opponent are tied for points, but you have no Pilot Skill ties. You win the die roll to choose initiative. In the past, the natural decision was to take initiative so that you get to place the big rock.
But now, in the age of big obstacles, is it still worth it to place the first one, or would you rather be able to react to the other player's placement? Personally, I'm starting to lean toward the latter, especially when there are two or four big obstacles. When you know where the first obstacle is going, you have a lot more options -- you can start a cluster of asteroids near the other one, put one straight across the field, set up a clear flight lane, etc, etc.
What are your thoughts?