The Starkiller plan scene is easily the worst in the film, but even then it’s still fun in a “don’t take this too seriously” kind of way.
What do you mean?
Random Dude: A weapon of this size must have some kind of thermal oscillator
Janitor: It does. (instantly points to a specific place in a complex holographic model) right here!
Oh, right.
Am I the only one who assumed that Finn working sanitation meant that he was stationed in the “sanitation unit” as patrol/guard, not an actual janitor? And considering these guys are raised from birth, they are probably educated to some degree in engineering.