You house would lose a lot more then a shingle or two if it was constructed on concrete that was not cured.
Probably why you cannot get Lowes to put up a 6 foot privacy fences with wind warnings out around here, of course that is not high dollar government contracts.
The reason they won't put up anything in high wind warnings is simply that materials like wood metal or others tend to be unmanageable and actually can hurt someone if a gust of wind moves them unexpectedly. Has nothing to due with concrete curing. Simple matter of they don't want someone hurt. Liability and perhaps a bit of caring about the people who work for them.
Dude! It ain't rocket science. The contractor was a dumb ass. Materials, as you said are hard to manage, wind load pushes newly set sections over makes them lean before concrete in bottom of post holes can set. It's kind of basic to the task. I know that fence contractors will not set privacy fence in a 30 -37 mph around here, because it does not work. It guarantees they will have to go back out and redo the job or not get paid by Lowes. Small fence contractor are smarter than that, The contractor doing the border fence is apparently unfamiliar with wind load, probably just glad to get a government contract, more afraid of falling behind than doing a good job. I'm glad the administration hires "only the best people."