CursedPh4nt0m Good question (I'm not even that certain myself). Easier powering of the secondary shield, bunks because three wide isn't exactly optimal for quarters.
Perhaps that power storage is quite obsolete... I could replace it with a crew quarters and remove the bunks while even keeping the same amount of power... Perhaps I should make a V3 of my missile module.
(Also, I love how some of my stuff is still on that module collection. 🙂 )