While our house was not damaged by the Marshall fire, we did have ember and debris land in our yard and neighborhood. (Part of a textbook page landed in our yard. It was a textbook for an environmental class and the page talked about climate change and natural disasters).
A few days after the fire, DH called our insurance company to make sure we were not underinsured, because those in the affected areas were already being told by their insurance company that they were underinsured. Our company did tell DH that they automatically increase coverage due to inflation while the companies being called out on the news did not.
Of the 1,000 homes destroyed in the Marshall fire, only one basement foundation was deemed safe to rebuild on. All other had to be replaced. Unfortunately for the family of the one "safe" foundation, the crews going from house to the next removing debris and foundations also removed the safe foundation. The company is still refusing to reimburse the family for the company's screw up. Because the family could not afford to rebuild, because of being underinsured because the foundation cost added on, they had to sell their lot.
Long comment here--apologies
If speaking about prolonged widespread wildfires I could see where someone's foundation is more compromised due to long exposure to high heat. The more common thing in my area is tornadoes and house fires and that normally isn't creating a situation where a foundation is so compromised it's needing to be completely removed unless code changes dictate this. But one's homeowner's insurance policy should be including a full reconstruction cost from ground up in the figures and for me personally speaking I was saying that the more common situation to occur to me would help out in that foundation aspect.
Technically our present insurance company insures our home up to $6million for reconstruction. If it costs more than the $813K it's insured at starting in September they'll still pay it. All our other policies have had 25% of the Dwelling on top of the coverage included in the reconstruction cost as just part of the policy.
Now something I could see is people not telling their insurance companies they did things that would affect the replacement and reconstruction costs, that would expose a lot of people who did renovations during the pandemic.
In addition people without inflation guards (we've always had one on our policies) which may not be automatic but is usually an option to add to one's policy or those who as Dan was mentioning thinking about market value as opposed to reconstruction cost and felt they didn't want their home insured for as high as the company wanted.
IMO the best thing people can do is ensure all your home's features and information is accurate on your policy and let the system calculate the cost then look at with your agent tailoring that. That might include for normal policies maybe you feel you want 50% added for reconstruction cost as opposed to 25% of the Dwelling or you feel you have more personal property than the percentage the insurance company lists. I was a stickler for accurate information and most of the time the discrepancies came from that, someone's basement was finished but they didn't tell the insurance company, they replaced the roof outside of insurance but didn't tell the insurance company, a claim occurred and they changed the material on their roof but never checked that the age of the roof and the materials were updated on their policies. Don't get me wrong I'm not blaming fully the insured, as insurance agents have culpability here too and not all agents nor companies are ethical all the time.
As far as the issue with the wrecking crew I'm honestly betting it was more complicated than it was being relayed to you. More meaning them claiming underinsured. There can be disagreements based on payout amounts but that isn't the same as someone not being insured adequately in the event of a total loss. In any case that's terrible about that crew mistake..it shouldn't have happened and I can't imagine how they felt, that's like hearing about how someone's home is demolished because the wrecking crew was at the wrong address, just awful.