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Hi. Brazilian here. A very humid country where I live. Here, almost all houses are made of brick and concrete, even near the seashore. There are even entire concrete buildings near Brazilian beaches (such as Rio de Janeiro, Santos, Salvador, Recife, Porto Alegre, Florianópolis and so on) as well as near rivers (such as Manaus and even at the capital, Brasília). Indeed, mold is a thing, a thing that needs constant cleaning. Wall painting does a role in protecting from mold buildup.
We don't exactly have hurricanes (because it's scientifically a thing from the northern hemisphere) but we do have tornadoes and strong winds very often. We have hailstorms. However, there are very old houses and buildings still standing since 1800, centennial houses.
That's fine and perfectly allowed, but constant mold cleaning fyi isn't good for your health in general compared to minimal or no mold cleaning. The concrete holds moisture, and the paint is what keeps it at bay, sure. But there are likely other materials that can be developed that might not do this. And there's also the impact to the environment to consider, as well as health impacts of what could be getting offgassed in our paints and walls, especially when mixed with cleaners because they are constantly being moldy.
It's not that I personally think concrete houses are bad anyway. I personally think housing variety is important and that housing standards are also important as we learn more about civil engineering. I think concrete has limitations as a material, which is long established in material sciences, that no material is a "perfect" material for everything. There are risks and flaws and benefits to every choice. Therefore again, to answer the question of "well why not all full concrete houses?" It's mainly the 25 FEET OF FLOODING that makes it irrelevant as a solution in this case.