With all due respect three is not a lot.

Thirty is a lot, three is is just one shy of a couple.

In the crawl we are told about the Death Star.

So if the audience sees a few details they will get the gist of where the story has moved to without having to see the whole station in one shot until our heroes do.

And when they do the audience like the characters should be knocked out at the scale of the station.

Well that's my opinion, though I recognise others exist with as much validity.