As I said in the UKF preview thread, this ability has the potential to be OP as fuck if it allows all friendly territory to be targeted which it now does, be prepared for it to be toned down.
Has the bug been fixed where the icon (or effect, unsure which) remains on sections even after the ability has long ended?
The only thing that has kept this ability under the radar is its requirement for maximum potential. As you mentioned, if the territory is decapped before 20-30 seconds, your frontline breaks and no fighters come.
If however you manage to contest it or the enemy attack after the 20-30 second mark, they can't even put a toe in the territory without being nuked.
It works wonders for late game final defences, but now imagine that across the whole front line where it is much easier to maintain the lines with 1/2/3 other players to mass the frontlines, defending against a push...
Should have remained as it is (only the players territory) but reduce the amount of time for the planes to arrive, this keeps it isolated in late game team games but also, sees its use in 1v1's more viable rather than throwing away 250 muni.
