Yes, the storm surge argument, is it flooding, or is it wind driven? That argument has been settled that storm surge is flooding, and anyone who lives in an area prone to flooding/storm surge should have flood insurance, which is only available from the federal government.
Floods
The National Flood Insurance Program includes in their definition of “flood”: inland tidal waters; unusual and rapid accumulation or runoff of surface waters from any source; and collapse or subsidence of land along the shore of a lake or similar body of water as a result of erosion or undermining caused by waves or currents of water exceeding anticipated cyclical levels that result in a flood. The big thing to take note of here, no property (that includes any Homeowners and Dwelling Fire Insurance Policy forms)covers flood damage as defined. Damage from flood waters is covered only by a separate Flood Insurance Policy and is subject to policy limits and deductibles.
If someone lives in coastal FL and doesn't have flood insurance, or doesn't know the difference at this point, that's on them. It's not ambiguous. The NFIP defines it for them. Wind blows the roof off and water gets in your home? Homeowners insurance. Storm surge floods your home? Flood insurance. Both happen at the same time? Homeowners buys your roof, the insulation, etc. and flood insurance fixes the flood damage. It's a huge pain for the consumer, no doubt. It's a direct result of insurers saying they were no longer going to rebuild the same property multiple times due to flooding.
Also, mobile homes are personal property, not real property, so depending upon the state, a flooded mobile home is treated as a vehicle, not a house, and is covered the same way a flooded car would be covered.