We have new homes here with roofs caving in, hell, even a few new HOMES collapsing due to slipshod construction here in SoCal !!
I can see that happening in individual homes being built by average general contractors.
In any track of homes, such a mess would be uncommon, because they do that for a living all the time and they've had more experience and can see trouble easier.
Builders want the stuff to have no major trouble for at least 10 years, then their responsibility lapses and they could care lass if it caves in, explodes or sinks.