It may also have to do with artistic license
You want to sell the Moonbase idea to the public, who is footing the
bill with their tax dollars.
Gleaming exposed domes and rows of shiny fuel tanks with spacecraft
landing nearby while brave astronauts are working outside with the
planet Earth hanging large and blue in the black sky they understand.
Building covered in regolith so that the whole place looks like an
ancient funeral mound site, they won't get, even if it is more realistic.
If they did Star Wars and Star Trek realistically, they wouldn't have
lasted a day. We space geeks are still in the minority - for now.