I have a preference for ships that are shielded as a foundation for my fleet, but as the tech tree progresses the ships available by default randomly change. I get ships with shields (Great!), ships with missile defense (fine), armor (crude but effective), or even nothing at all (How immodest!).
Joking aside, is there a way to choose the defense preference as far as what ships appear in the shipyard build menu that I've missed, or is this feature just not in the game?