[Tomgs]

The probable reason for the EA having an old design fighter is that when a planet is filled up with units or it reaches its build limit (whatever that is set to) the old designs are not scrapped or moved and new ones built. You will see this with almost all the AI races if you look at their weapons platforms. On the edges of their empire they have new design weapons platforms but on their homeworld it is full of their first design. There should be some setting in there to say scrap a certain percent after a certain time and build new design units. But so far the AI doesn't seem
to do this.

By the way since the patch I have actually seen the AI do some retrofitting of some of its ships. I don't know how often but I know that at least it is capable of it now.