The skill descriptions do need to be updated to better explain how stealth and stealth detection works. Beyond that though I don't have an issue with the current balance of stealth orbitals in the immediate future as they're purely defensive in nature and can be countered in a variety of ways. Researching stealth tech is the most direct way but a trader can effectively disable the planet without firing a single shot by making use of smuggling to siphon off it's population and along with other trade skills to harvest resources from it without giving anything to the owner of the planet.

Lastly the only specialty that requires one player to attack another player to win is the Warlord which can circumvent the stealth orbitals altogether by using PK's.