I can understand things like generators and stuff that you wouldn't put in an enclosed room but why did they leave so much out?
Maybe because they are all located in the market? And they wanted to make the home crafting system more lucrative?
How do you even get that house? I've received a house in Vault 81, the Institute, Pyrdwen (Danse's old diggs) and the root cellar in Sanctuary Hills. I've seen the house in Diamond City but haven't found anyone that offers it to you.
Talk to the Mayor's receptionist after you finish finding Nick. She'll offer you the house for 2000 caps.