Inkless
But here's the issue with your logic: There is no inherent weight limitation, or even space limitation, in space. (hence why it's called space.) However, there is a very constant, very real cost limitation - If such a big ship gets absolutely deleted by smaller ships that are worth less, then isn't it like the battleship that gets rekt by torpedo bombers?
Now, in terms of logistics, smaller ships are more painful than bigger ones, but that isn't being debated here.
Also, does AI just let the cannons autofire? because last I checked the cannons work properly (also cannons are still a bit OP)