The church left the classist views of people during Vatican Council II.  It recognized THEN, what changes had been going on in the world since the cultural catastrophes of WWI and WWII.  Society and culture CHANGED far more than anyone could have anticipated.  The traditional Western European [and American] understanding of marriage [as a preindustrial agrarian arrangement that viewed both children and family as economic] rather than as emotional units has gone.

The 1930's were filled with Catholic writings that attempted to help couples understand marriage in their chaotic world.  Many of these writings came from Europe:  In France, Abbe Violler published  MARRIAGE [1932], THE PSYCHOLOGY OF MARRIAGE [1936] CHRISTIAN LAW AND MARRIAGE [1936].  In Germany, Dietrich von Hildebrand, published MARRIAGE [1936].  In 1935, Herbert Doms's book ON THE MEANING AND END OF MARRIAGE was published.  By the time of Vatican II, the concept of Companionate Marriage had been going on for 40 years.