That's why they have cruise missiles.
the stealth ability's of a balloon are none when fighting an insurgency as they tend too have no radar but depend on there eyes and communication like cell phones,
now here is a huge lumbering slow moving coin aircraft. the enemy is just going too go too ground when they see it coming you need a platform that can move in and respond as the situation is developing not take photos from over head well after the baddies are long gone.
The platform is just too big too slow and too troubled. A coin aircraft needs the legs too stay on station yes need the eyes too see trouble but all so the fury too bank and move form station too trouble bay down the hate and get out. it needs the bad guys not too see it until it brings the rain. A balloon is too big and two slow.
then the only viable duty is sentry and patrol duty for these baloon or just make them stationary radar platform to watch borders or pirate if we set them to patrol the ocean?