It offends me that FS doesn’t have a air defense base improvement. I get that the DLC is all about the interception events, but it’s just frustrating that PP bases can be attacked from the air and not be able to do anything about it.
In order to continue to have interception be the key component, I propose that the defense facility not stop the attack, but instead slow it down, and do some damage to the attacking flyer. Basically, the flyer needs to disable the air defense facility before it can damage the base, and it takes some limited amount of damage until it does so.
Also, base attack flyer missions should be geoscape time stopping events.