I think this may be more nuanced by the addition of a caveat that the EPA should be factoring cost in if cost is necessary to explain the "technical, operationa

I think this may be more nuanced by the addition of a caveat that the EPA should be factoring cost in if cost is necessary to explain the "technical, operational, and legal details necessary to implement laws" enacted by congress which they seek to implement regulation. For example regulations pertaining to a "Consumer Re-affordability Automotive Program Act" versus a "Countrywide Automotive Reduced Emissions Act" (Quote from EPA's regulatory agency description)