It makes cleanup after a tornado real easy. Seriously it sounds a lot like new home construction around here too. The GC's there basically subcontract out everything and each trade is a separate sub much of the time. Framers are a sub, drywallers a sub, tapers another sub etc with much of being a cash deal.
The problem is not with the quality of work but with what each city or county puts out as code. Many of the fly by night GC's that pay the subs promise them a certain amount and then short pay them or don't pay them at all. The ones who are illegal don't really have any recourse. The homeowner gets a low cost home and the GC makes a decent profit. The guy's who were tradesmen 20 or 30 years ago are shutout and can't compete with someone making $8 an hour framing a house.
What I see as a worse problem is some kid fresh out of HS who can't afford college or doesn't have the desire to go and wants to get into a trade such as carpentry is screwed because the opportunity to get into the trades and make a wage he can buy a house on and raise a family is pretty much nill. Post tension foundations are pretty much mandatory in the southwest and other areas and while it increases the initial cost it all but eliminates the slab from cracking as the soil heaves especially if it is comprised of dirt/sand/clay after a good rain when it hasn't rained in a month or two.