Woodworking

I'm hoping someone here can explain something that I haven't been able to find a satisfying answer to - why don't traditional acoustic guitars crack? I mean obviously sometimes they do, but it seems to me like that should happen all the time. For anyone unfamiliar, the front (top) and backs of wood acoustic guitars have their grain direction running parallel to the neck. And inside, there is bracing. That bracing runs perpendicular to the grain of the top, and the bracing is typically glued to the top. Gluing perpendicular grain is generally considered a huge problem when it's an item of furniture and it would be reasonable to expect an object constructed like that to tear itself apart in a few years as humidity fluctuations do their thing. But guitars usually don't do that and I don't understand why.