@cornwallis Dark Skies have so many options because the bombers project power in so many directions: Moscow, Middle East, Egypt, Med, “France”, Scandinavia, and the Atlantic. It gives you both offensive and counter-attack capabilities, giving you flexibility to respond to the Allied strategy.
If the UK helps stack Moscow to make for an expensive G6 attack, I swing down towards the Middle East with the fast movers. Italy opens the way with the small group of tanks/mechs. The attack often gets bogged down near Iraq/Persia, but time is now not so critical for the Axis. The powerful bomber force combined with some ground units and perhaps a few subs can force it to be expensive for the Allies to protect their units in all of the threatened regions. Eventually there will be an imbalance when Germany gets up to Round 11-ish. Once one of the dams holding back your forces is broken, it is impossible to contain the German ground units with the powerful backing of the bombers.
Look for an economic victory towards Round 15 when the Allies realize that they are falling further and further behind with no way to catch up in total unit value and hence give up without a final major battle.