> If a house is pre-planned, you can use a machine that cuts each board to length, and join the ends of each board using basic joinery processes that aren't practical when building a site-built home. You can pre-fabricate things like trusses and wall segments

aren't prefab trusses readily available these days? i feel like i've seen plenty of trailers hauling stacks of 10 timber trusses down the road.

we've also got prefab homes (not mobile/trailer/whatever homes), with modules assembled in factories and brought together at the site. unfortunately they seem to carry class connotations here in the US.