Hangars don't have this problem, however they use a very large number of tactical points, so any one planet will probably only have 8-12 squadrons, most attack forces will have about that many squadrons as well, along with a whole lot of other stuff.
QFT!
Just last night I was doing great and then in jumped an invasion fleet from another star system with what I swear had to have been 15+ carriers and an upgraded Sova. All I saw was a swarm of purple. My poor little planet was ravaged as the bombers picked away at the system defenses and the ships stayed outside the range of the gauss cannons. Didn't stand a chance.
Those fighter/bomber swarms are nasty.
In regards to the gauss cannons, like someone else said, the tactical AI charges right in. So sometimes it's necessary to micromanage or lose the fleet. It's not bad when there's a couple but when there's 6+ clumped up and in charges your fleet... that's frustrating. Would be nice to see more options for the tactical AI.