To anyone who actually knows what the Church teaches, and has been teaching for 2,000 years, there simply is no question.
Some people cannot understand that discipline - the rules - is ultimately subject to the decisions of the current Pope. There are a multitude of threads showing there are people who cannot comprehend that issue. A very simple example is the change in Canon law, from 1917 to the 1983 code. There was an expansion of the issues which could show that as of the date of the marriage, there was a failure to confect the sacrament. In short, much more emphasis was put on the sacrament of marriage as a covenant, rather than as a contract.
As to the Mass, over the centuries, bits and pieces were added to it which originally were not part of the Mass. For example, the Last Gospel was originally not part of the Mass; but somewhere along the line it was decided to add it. The Bishops wanted to go back to things which had been discarded over time, and remove some of the things which had been added. The Mass in its form was retained; a few prayers were eliminated; some of the rubrics were changed. It was nowhere near as big a change as some like to make out.
Pre and post Vatican 2 “being a Catholic” has expanded, for example, in the Mass; rather than as simply showing up and staying for the length of the Mass (i.e. “meeting one’s obligation”) we are asked to participate in it. At least in theory, we were to participate in the Mass pre Vatican 2; but many simply endured it. That, in part, was why so many devotions were so popular; people actually involved themselves in them. And that is why, in part, so many devotions are far less popular, or in many areas, are not to be seen. Our first and highest participation should be the Mass; and thanks to Vatican 2, we the laity have been invited and encouraged to participate in the other liturgy of the Church - the Liturgy of the Hours.
Being Catholic may certainly include saying the rosary; but that, as a private devotion, is far secondary to participating in Mass. Our duty to the poor did not start with Vatican 2; but certainly there has been even more focus on it. The 10 Commandments didn’t go away, nor has the moral teaching of the Church. Adult catechesis is far, far greater than it was before Vatican 2. Scripture study is far more emphasized than it was pre Vatican 2; and we have wonderful scripture scholars such as Scott Hahn and Brant Pitre providing that to the laity in understandable terms.
In short, we have moved away from an all too common attitude of laity were there to “pray, pay and obey” to recognizing they too have a vital role in the Church.