This article from the Alliance for Responsible Professional Licensing sets out areas of concern related to universal licensing laws, specifically that not enough attention is given to substantial equivalence - "the trust and confidence that the qualifications underlying one state’s license are on par with those of other states." The article cites the mobility of medical professionals across state lines during the pandemic as an argument in favor of rigorous standards and substantial equivalence - the country was able to respond to the pandemic because of the "strong, consistent licensing standards [that] are a critical foundation for professions entrusted to protect the public."