[brudgers]

We have standardized components delivered just in time by ordinary vendors and installed by subcontractors specializing in that work.

It is all commoditized and builders and trades people have choices about who they work with and long standing business relationships.

The inherent complexity of construction is a job shop scheduling problem which is not just in NP it is NP hard.

With a whole additional dimension of human social relationships and woven in. Everyone is trying to solve their own NP hard problem across a different set of projects and under a different set of constraints.