Benefit == cheaper due to less labor. In theory, no tradesmen would be needed: general contractor, concrete, framers, plumber, electrician, roofer, painting, drywall, finish work, ...
I think this would be most feasible and tested out first in tract housing of second\third world countries first where they can start with simple designs and fewer requirements such as electric and finish work.
It makes me wonder about a couple variants:
1) Instead of building on-site, perhaps this starts out building pre-fab pods\units which are then delivered, can be joined, stacked, etc. Need to be light though as in manufactured homes, so that rules out the more classic ICFs in favor of more foam with post\beam design.
2) Buy\rent re-usable concrete forms that easily assembly into a standard pod shape (like this
design who designs with hexagons and rectangular join sections) then you would form up a pod and a connecting section (add the sheets of foam insulation and rebar to the inside of the form), pour it, then re-use the form to make another pod, make a stacked pod, etc, one-at-a-time. Idea being a DIY home although this approach only covers the concrete trade...