I mean, aren't chips just electrons, protons and neutrons? :) More seriously, the 5g spec is a complicated and long document. Implementing 5g functionality in silicon is not a weekend project and implementations tend to be protected by NDAs and kept as trade secrets, etc. Ultimately the rationale is that development of these technologies is a complex, non-open-source, and costly endeavor. The nuances of _why_ this is the status quo are more human than technical in nature.