I don't think that the people involved with the reboot are working with the same considerations as those who worked on classic Trek. The people who were involved with the latter attempted to make the world as believable as possible, while working within the limitations set by a continuity in flux and the demands of a production schedule. These were people who wrote technical manuals and blueprints that explained how this technology supposedly worked. I think if we asked the people involved now how something works, with one possible exception - Eaves, they couldn't tell you how it works. They are working for the "Cool Factor". Big ships are cool. That gun or cannon or whatever it is that the Vengeance
fires is cool. The Enterprise
is big, the Vengeance
is bigger, and that spacedock is massively big. What more do you need to understand?