Yeah, but houses are rarely like a serial manufactured car. Sometimes you have to lay down every row of bricks differently with a ton of unplanned (or unplannable) things to account for, because the electrician might work while you lay your brick etc.

Not that you cannot automate whole houses and sell them off the shelve for cheap (see prefabs), it just isn't something that could be done at a site where your brickbot 2000 has to share the job both with the workers whose jobs it replaces and with people from non-brickbot-2000-educated workers from different companies.