As it has probably been discussed multiple time carriers in their current state are extremely overpowered. As the AI currently will not build units with these add-ons and has no true defense against them b lining for carrier technology can cause even a worst case scenario (5 massive angry AI's all coming to crush your defenseless final 2 planets) into an almost laughable steam rolling comeback. I'd like to share some of my thoughts on how to improve this aspect of the game.

1. Make Carriers a type of highly mobile shipyard - One way to mitigate carrier spam might be to make it so that carriers have to rebuild lost fighters over the course of several turns to at least force a player to slow down their advance. As it is currently carriers are never truly vulnerable after a fight. (Oh I lost 29/30 fighters in that last fight? And I'm being attacked again? Lucky I have my little portable pocket dimension full of fighters to keep me at 30/30) 

2. Make a good "fighter killer" type weapon - At the current build of the game there is no effective way to kill fighters quickly. While a swarm of 60+ fighters should be able to take on a capital ship (depending on respective weapons/defense technologies) there should still be massive losses among the fighters. Some ideas on how to fix this are...