I think the act of defending is largely unrewarding in most scenarios in the game, the exceptions being wars and Atlas actions. And even then, with wars, you’re better off defending the Hell out of your highest bases and allowing the weakest bases to be taken (maybe getting a defense point out of them, but not anticipating that you’re going to stop the attack).
With Atlas it’s particularly frustrating. Say you’re on a team with a few “bigs”. Atlas attack starts, they move in their primarchs, and you’re on defense duty. That “big” is going to get glory from their attacks, and you’re earning them glory on the defense side as well. So your actions as a defender get you, what, a couple of defense shields and a hammer or two, while the person you defended gets glory for both the attack and the defense?
Defending a base other than your own should reward more than it does. It doesn’t need to be all that much, but more than what it is.
Bronze chests, diamonds in Atlas, an increase in the number of defense RSS awarded…something.