This will allow you to be on much better terms with any empire than you normally could get away with.
Rebellion doesn’t happen on well-built colonies, so this ability is totally irrelevant. This cannot easily be felt but does speed things up considerably when running a large empire. Best to buy equipment from other empires even if you wanted to be independent, social items should be the last on your list. Best to buy equipment from other empires however, if you are trying to be independent, you could do worse. 20% off ship passive upgrades (like health and cargo size) from your empire. Grants 1.5x ship power for everything, not just weapons. 3: consistently convenient or situationally helpful.4: consistently helpful or situationally game-changing.