That doesn't mitigate much. The mass of a paper and matchsticks "house" just isn't enough to resist it getting torn apart - if not by the wind, then by debris.
The only kind of structure able to survive a dead-on hit is steel bar reinforced concrete or very, very solidly built brick-and-mortar. But that is expensive to build.
That isn't the goal, because the eyewall of a Cat 5 is minuscule in footprint compared to the surrounding wind bands.
Consequently, most houses are going to have to deal with those winds, for which timber bolted to slab + properly secured to roof is perfectly valid.
It's uneconomical to hurricane-proof all housing in Florida.
It's entirely possible (and has largely been done) to mitigate the bulk of hurricane wind impact (the lesser standard) for all housing in Florida.
Given the yearly news about record breaking destruction... I'd say it is uneconomical to build in Florida at all. The only thing keeping some regions (in addition to FL and other hurricane hotspots, add California for fires and potentially earthquakes) afloat is politicians bribing populations by promising government bailouts or by forcing insurance companies to offer coverage by law even if it is extremely expensive.
The amount of waste and human suffering generated because of these perverse incentives is staggering.
Yeah in advance enough to prevent loss of human life, but still, if you're hit, everything you own is gone. There just is not enough time to pack up more than maybe your laptops, phones, a bag of clothes and your most important paperwork.
The storm surge goes up (and a whole bunch of water falls on top of it). The storm surge goes down. This isn't some river bursting it's banks.
Between the requirements imposed by needing to resist hurricane winds and the slab ties it's "good enough" that there's a 99.9999% chance the building will stay on it's foundation long enough for something else to be the problem.
FEMA has a flood rating specifically for exactly this situation: V. They have this because it carries additional hazards beyond normal flooding seen with storms.
> Coastal areas with a 1% or greater chance of flooding and an additional hazard associated with storm waves. These areas have a 26% chance of flooding over the life of a 30‐year mortgage.
And here's a video about researchers at the Oregon State University's Wave Lab studying this exact thing:
Someone in a subdivision that's a few miles inland with a mangrove swamp between it and the ocean anyway has to care about New Orleans style flooding, not "what sea state is my picture window rated for" flooding.
Like there's a reason that Florida building code just says tie it down and call it good. It's just not necessary nor economically worthwhile to try and make structures shrug off the surf. Sure, literally on the coast type stuff will get rekt (most of that stuff is concrete now though) but the average modular home subdivision doesn't need special requirements above and beyond what it takes to shrug off the wind.
When it comes to wind loading the code is basically a fight between evil civil engineers who want the state jackboot to force you to buy their service and the hardware makers (Simpson and the like) who'd prefer you reference a conservatively pre-computed table and install that much of their hardware.
There are many reasons to shit on Florida but their building code is pretty top notch (and this makes it expensive but everything has tradeoffs).
And I didn't disagree with you regarding building. You were wrong about storm surge always being static -- it mostly is, but importantly sometimes isn't. But you weren't wrong that there's not a lot to do about it. This is one of those situations where nature will win if it wants to. Best thing you can do is just not be there when it does.
