Other than the the document on Liturgy, documents mostly reflect changes that had been taking place already. Some laity had already been far more active by the 1950s, so a document recognized and tried to guide that.
Convents already were in process of renewal, so a doc tried to guide that. Catholics were already using TV and radio. Do you think broadcasting was adequately covered in the council of Trent?
Since WWII, Catholics had been involved informally with Ecumenical contacts, and were already discussing the need to oppose antisemitism, partly as a result of Hitler. So some new docs were needed to help direct or formalize the Church’s response. The docs on Catholic Education, Priests, and so on took into account existing trends and tried to influence them in light of Church teaching.