Also worth noting that today's rules, 89 FR 7456, and the previous one, 89 FR 103054, both derived from the same NPRM. Apparently, based on feedback they though

Also worth noting that today's rules, 89 FR 7456, and the previous one, 89 FR 103054, both derived from the same NPRM. Apparently, based on feedback they thought some parts of the rules needed more work than others and finalized them in two parts.