Taking out dar for an entire side is bad for game play. Sure, sure, you should intercept the bombers, whatever: it's still bad for game play.
On many maps, the HQ is easily reachable by flying NOE, which makes any defense about impossible as a Lancaster will reach it's target in less than 3 minutes after HQ alert has been triggered.
This problem is a problem of balance. A single player, going NOE with very little risk, can inflict the most disruptive damage to a whole country.
In my book, efforts on both sides and the results should match.
And now I see we are on the 'no HQ' map again. I log on, dar is off and will be for about another ~100 minutes, thanks to a front line city that's also almost indefensible to NOE raids.
Raise the HQ damage requirement significantly, or cut the connection to the city. I'd prefer the former one.