That' funny. In some cases the new homes have newer construction methods that make them more resilient, such as hurricane straps or better fire resistance.
People in red states can't afford those materials. Half of the houses in the Midwest still use PVC siding and wooden stilts in crawlspace. The first hot day or heavy rain they see and they start melting and molding. But that's all you can do on $30,000 a year from your Walmart job when every other employer in town leaves for the coasts.
If these were really common issues, the code wouldn't allow them. The melting siding is generally caused window reflections from other houses, especially with high efficiency windows. This happens all over the country.