The barrier is, the construction industry's "awful" productivity.
It cites this paper:
https://bfi.uchicago.edu/insight/research-summary/the-strang...
the number of houses or total square footage (houses are getting bigger) built per employee each year was flat or even falling over the last 50 years. And the researchers believe the lack of productivity growth holds true for all different types of construction.
And:
According to an estimation by the McKinsey Global Institute, construction, one of the largest parts of the global economy, is the least digitized major sector worldwide—and it isn’t even close.
Mckinsey is the Jim Cramer of technology. If they say something has poor efficiency it likely has way way better efficiency than they are capable of understanding.