That wasn’t the Second Vatican Council per se. Both the new Mass and the use of the vernacular were introduced by Pope Paul VI after the Council concluded. The

That wasn’t the Second Vatican Council per se. Both the new Mass and the use of the vernacular were introduced by Pope Paul VI after the Council concluded. The Council had called for the Mass to be “revised”, and for “increased” use of the vernacular, but those were rather open-ended requests, and Paul VI could have chosen a far more conservative approach (closer to the modest changes made by his predecessor) than what he actually did and still have fairly claimed to have been doing what the Council demanded. And then, when his reforms got to the diocesan and parish levels, a lot of people took them in directions that Pope Paul himself likely would not have approved.