The game does replace doors. The builder just left them off.
Also, I don't think it's fair to blame builders. I thoroughly playtest all my builds and I have a running checklist of things I normally forget like trashcans, mailboxes, toddler potties, etc and I forget things all the time. My most recent forget was forgetting an ENTIRE BEDROOM. Literally, I made three kids beds, furnished the entire house, and then uploaded it. When my playtest parents were going to sleep, they went to the kids' rooms... because there was no master. We're human. We forget things. Just because our builds are fantastic and incredible doesn't mean they aren't flawed. Yelling at us does nothing. If we forget things, we'll say something in a comment. If you find something, you can comment it too (nicely though). I just think this was uncalled for.
