I just now got the game. However, I played GC1-3. GC3 used to try and limit the number of survey ships with admin points, but did a poor job at it because there were plenty of ways to boost your admin. GC4 has SO many events that it makes sense to try and throttle that.
What I especially like are the survey ships that can fight, so that it forces you to make a game decision whether to send the Enterprise out exploring or to join the fleet and fight. Can't do both. The Drengin are up north, but the deep space anomalies are down south.