Yeah more ships is a requirement for thinking of raids at all. I am assure of that.
A rancor would be considered too big for the screen aswell. But what did the devs do? Change the environment and the perspective and there you go. We have a Rancor raid.
The same could happen with the death star. It just needs a different persepctive than the standard fleet fights.
I think the devs could think about this for 2019. I am aware that this is nothing that could be realised this year. But when running a company, you should have a shedule of what ur trying to achieve in what time. It helps the devs working harder cos without any target you loose your focus and dont work that precise anymore. I hope we get some more dev/community manger interviews to see wihtin the next weeks.