Why don't all assets revert to the civ that conquer's?


Sometimes, the winning civ receives the surrendering planets, sometimes not.
Understandable.

However, the the winning civ does not receive the resource (or other) starbases nor the ships.

I wonder, why?!

Some of the ships might 'self-destruct' to avoid becoming under the control of, but, especially if the conquered civ surrendere's to the civ they are at war with, why wouldn't the resource bases revert to the winning civ?


And the ships, as well.

Some of the ship commanders, at least some of them, should surrender to the conquering side.


It is not so, however. The ships simply dissapear, as do the starbases.

Why?