@Cornwallis dark skies is a terrifying offensive and defensive plan. Bombers have so much versatility to project power, especially when combined with a few other units such as infantry or subs.
Offensive:
*you can create attack zones where opposing stacks have to retreat or else be wiped off the map. For example Germany can threaten Moscow and the Middle East simultaneously so UK has to abandon one choke point.
*strategic bombing should not be underestimated. 4 bombers going after Moscow will slow down Russian defensive buildup. You lose 8 TUV on an average turn, but prevent purchase of five Russian infantry. Great ROI
Defensive:
*kill zones are so useful. You can make it impossible to move into key territories. For example you can make it easy to counter-strike a Normandy landing.
*unit purchase behavior changes for the opponent changes when you go Dark Skies. For example a stack of 10 bombers combined with a few subs requires a substantial fleet to protect amphibious landings.
Overall Dark Skies is a slow buildup with few major battles. You will eventually overwhelm a theater of focus as the opponent can’t simultaneously reinforce 2 or 3 territories even with superior income. As long as your income isn’t grossly inferior, you will eventually win. Moscow or the Middle East or India don’t have to fall in the early game. It is like a boa constrictor with increasing pressure as the bomber fleet reaches double digit numbers.