Some interesting technical decisions in the file format, USDZ is a zip file with no compression or encryption for zero copy / mmap the file from heap. 64 byte alignment for AVX512. Consideration given to file ordering for streaming and LOD.
I’m not sure where I’ve seen the uncompressed storage before but it certainly isn’t a new idea. Not sure if it still relevant though, it’s a waste of space and bandwidth and you have to make sure the tradeoff is worth it.