A whole town reaching end of life together
Where housing goes up over a few years, roofs and HVAC reach the end of their service lives over a few years as well. That concentrates claims and it concentrates carrier attention. The useful question is whether your policy will still replace a roof rather than depreciate it when that window arrives.
Desert drainage around new development
Washes here carry nothing for most of the year and a great deal occasionally, and building changes where water goes. Flood is excluded from every homeowners and renters form sold in Arizona, so proximity to a wash is a separate policy rather than a footnote on this one.
Pools, and what they do to liability
A pool raises the ceiling on a liability claim regardless of how ordinary it is locally. The dwelling limit gets reviewed; the liability limit usually does not, and it is the one a serious injury claim tests.