I offer this just as a point of information. I was born in 1951 and have very distinct memories of life pre VII, albeit mostly has a child. Lay people were involved with evangelization "back in the day", and their role was supported by the Church.
Well, I am talking about 1000s of free wheeling online NOers who are today's "digital missionaries," not the relatively few lay Catholics from back in the day who had the Church's support via their Catholic priest's or bishop's approval - to teach what the Church teaches - or they would not be permitted to do it.
Heck, today, a trad bishop, priest or even lay Catholic who publishes a good trad work on theology or some such thing would likely find it impossible to get the Nihil Obstat and Imprimatur from any of the NO bishops - but they're fine with free wheeling NOers spouting pretty much whatever they feel like.