This is an awfully petty hill to die on, especially for this website. The material difference between Postgres and MySQL for the overwhelming majority of users

This is an awfully petty hill to die on, especially for this website. The material difference between Postgres and MySQL for the overwhelming majority of users is insignificant. They're both good pieces of software and there are hardly any features missing in either that anyone who's not a DBA would miss when comparing one to the other. It's like arguing against using Firefox because Chrome "won the war". Who do you think you're convincing?