Well, a long chargeup time is still very unbalanced. I can just camp with hundreds of lancers/bombers/fighters/executor and wait until the laser is charged then blow up the 16000+ main space station. then finish off the rest of the shipyards and enemy.
If you have a fleet that good, why do you need the Eclipse or Sovereign anyways? If the enemy fleet is so small that destroying the station removes any chance of them winning, they were probably going to lose anyways. The SSDs (Executors, The Eclipse and Sovereigns) have taken quite a bit of focus from the team for balancing, and we think we've got them in a good place. They're hard to beat, but nowhere near impossible. The Superlaser is very helpful, but it isn't capable of winning the battle for you.