I’m going to guess that either there are no standards to meet for those, or the standards also just happen to line up with the current cheapest material and construction options.

Or they are only covered by standards that are complete jokes. Like the fire standard I saw at my old job that a pack of printer paper would easily pass because it was just a time before burning a hole through, and the paper pack took longer just because of how thick it is (the time was like 5 minutes or something if I recall correctly).