I have been enjoying reading Rodney Brooks’ pedantically written blog, where he tracks the realization of the skeptical (or realistic) technology predictions he made years ago.
I was surprised that the first robots were already being fashioned to look like humans as early as the 70s! 
Despite those agile-looking dance propaganda videos, robots don’t hold up when moving from a flat, learned environment to rugged unpredictability.
Robots on a construction site, where safety is a concern and there are hazards all over the place… I don’t know about that.
For example, what happens if a robot needs to be shut down suddenly while it’s carrying something heavy? Does it drop it immediately, potentially on top of someone?
Heavy robots are dangerous if they fall. That’s why the robots currently being designed are lightweight. But then again, lightweight ones can’t really carry much of anything.
I could also imagine that on a construction site, there are many things done with the fingers without seeing exactly what is being done (at least when installing various bits and pieces). For robots, this is a total impossibility at the moment!
Progress progresses, but it takes time. A lot of time.