There are some places doing things similar to the Factory OS but for home. 100% prefab homes have a certain stigma in the US due to quality issues. Also many people want an at least somewhat customized home so there's limits to what can be pre-assembled. There are some parts that are being pre-assembled offsite and trucked to the home like the Factory OS in the article. It's just mainly the framing etc that is predone then the customized elements like flooring and fixtures are added on site.

One big factor preventing us from doing the same thing as the article for homes is the need to support customization. With a large apartment complex there's enough of the exact same sets of rooms being created that building them all out then shipping out makes sense, trying the same thing for homes (without a change to people accepting much more identical housing) would require stocking and setting up a lot of different tile and hardwood and loosing scale efficiencies.