Cockpits aren't too useful with electronics, unless your electronic goes down. You can track an enemy craft without watching what is possibly below you. The truth is, you only need to see what is in front of you because nobody is going to turn their guns at 90 degree in any direction to shoot something. Minimizing fragile parts of a fighter is critical in its survival. A bubble cockpit is only good for tourism I'd think.
Concerning Fold wings; again, let's remember that the Defender is the heavy variant of Liberty fighters. A modular wing means augmented fragility of a craft (and this is why some contemporary aircrafts have a "Navy" version of themselves, with folding wings to make storage easier). I thought I should pass this trait down to the patriot, a lighter craft meant for interception which doesn't rely so much on solidity.