Nice try, Lex. My comment specifically mentioned regional histories related to PROHIBITION. That implicitly denotes a legal tradition. Don't try to act like I am changing the topic of debate.
The topic of debate is using the law to enforce cultural and religious traditions. If you are keeping legal artifacts for the sake of the laws, themselves, why? There is no need for archaic laws.
If, OTOH, you are for maintaining Blue Laws because they cater to your own religious preferences, that is simply using the power of the State to impose your religious beliefs on others. If for the nebulous "cultural legal tradition", then why not Jim Crow? It was a long standing legal tradition to enforce cultural prejudices as well.
Any way you slice it, blue laws are simply legally enshrined bigotry.