Ive watched those Facebook videos and they are interesting. One can learn from where to "look" in a home.
I never used a home inspector on a new or used construction and never will, at least while the house is being built. I did for the first time in my life get one on the current home of almost 2 years, got an inspector before my one year warranty was up. Nothing ground breaking, said we were in better shape than most.
Still by doing it while under warranty, all I had to do was submit the list of 10 or 12 items to my builder and with lighting speed all taken care of. Nothing ground breaking, biggest thing was a popped roof nail or two and a missing filter bracket 8x8 inside the HVAC filter box that filters income outside air and other minor things, so all told, I suppose it was break even, between what the repairs would have cost and the $450 I paid him. Peace of mind, nothing wrong with that and I would by all means suggest people get inspections. It makes sense if you're in a new home already and your warranty is about to run out. Then again I had a responsive national builder. All I needed to do was email the PDF report summary and one by one, almost instantly I was getting calls to set appointments to fix the issues.
Im a bit more street smart than the general public, though. Nothing wrong with having someone inspect a house while being built either.
AS far as other comments in here that new home builds are trash compared to the old days, ummmm, no, I dont agree. New homes built to much more strict standards for plumbing, electric, storms, safety and energy efficiency. Nothing comes close to a new build and like a modern appliance will pay back in energy efficiency. It's REALLY stupid how cheap it is to run our new home. More stupid than stupid

BTW- for those who feel differently, remember the re-sale home doesnt get an inspection like some of the new homes get in the videos, because the siding and drywall is already up concealing any issues, so less issues will be found.
The problem with national videos is it makes a problem seem bigger than there is, though with any construction throughout mankind's history there are some bad builds. With well over 1 million (1.5 million I think) new homes built every year it's easy to make videos of bad ones. But there are some bad ones, however those are the only ones that make the media.