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Ah yes. Much of this has to do with regulations surrounding the blueprints. It's extremely expensive to get a fully custom blueprint drawn up. Every tiny thing has to be analyzed and stamped by licensed architects and engineers, even if the general design has been in use for centuries. Nearly all houses are just some cookie-cutter pre-approved design these days, and many larger structures are essentially that. They move around some modules but don't have to redo all the work for them.

Construction cost also comes into play here too. There are so many mandatory expenses nowadays that they have to cut every last corner everywhere that isn't mandatory. The exterior walls have R90000 foam insulation lest a single joule escape and blow up the planet (or hurt Owens Corning's quarterly profits), but it's glued to OSB that is going to rot and fill with mold in 10 years because it's $3 cheaper per sheet.