I'm sure you know, but to clarify, drywall is not structural. Load is borne by lumber in most cases, though some homes in America are built with structural masonry; South Florida builds a lot of homes with concrete masonry units, for example. The drywall is just there as a pleasant skin to hide the structural underpinnings. There's nothing stopping someone from using drywall in the interior even in structural masonry buildings, and this happens pretty often, in fact.

There's nothing wrong with wooden houses! They're a cost-effective method of building, and with proper care, such houses will last over a hundred years. Masonry buildings, of course, also need care to avoid falling apart, though probably less so than wooden buildings.

I don't know where it is that you're from, but I'd wager that large parts of the US sees harsher climate conditions. Between hurricanes, tornadoes, earthquakes, and wildfires, American houses have to deal with a lot. Properly-constructed wooden houses handle what they need to.

Sure, you could say that all else equal, a masonry structure is more durable than a wooden one. But as they say, anyone can build a bridge that stands, but only an engineer can build a bridge that barely stands. Cost is always an object in the real world.