It clarifies the faith; would we not want the faithful to abjure and reject heresy? For heresy is damnable and effectuates the death of the sin in mortal sin. That's why the Holy Catholic Church has so strongly spoken against it. Additionally, until 1992, it was
the Universal Catechism of the Holy Catholic Church, and still today it remains
a universal catechism of the Holy Catholic Church; its concepts, principles and wording remain valid for today; contrary to those naysayers who would repeat the unwise axiom of the Modernists, who insist that the Roman Catechism is somehow antiquated and that we need to "grow up" in the faith, thinking that is is somehow childish or only valid or efficacious for the "rudimentary" and simple-minded folk of yesteryear.
.....such sentiment is simply twaddle, ignorant, and untrue.
With the advent of the heresies of Modernism, Post-Modernism, and the Indifferentism that seem to plague the Holy Mother Church, it would seem those emboldened by the desire for Christian unity [those hyper-ecumenists] would put forward a false "unity" or "irenicism" as if to say that the Protestants sects were no longer heretical or that their doctrine was no longer potentially damning to one's soul: contrary to what the Church has believed to the sad state that Luther, Calvin, Zwingle, and Cranmer were in: leading so many souls astray from the fold of the ark of Salvation that is the Holy Catholic Church.
Juxtaposed to this "Irenicism," would be a true desire for "Christian Unity" unlike the false Ecumenicism peddled sadly by many errant Clerics within the Church. This true Ecumenism then, is conversion to one Holy Catholic faith, not rather some imaginary "lost unity" with Prots, that "unity" of the Protestants who somehow imagine that the Church of God has somehow ever been divided, when in fact it is the forefathers and founders of their sects who departed the One church of God, which is the One True Holy Catholic and Apostolic Roman Church of Christ's, a Church, which never was anything but One, as Christ is one, and as she is the Body of Christ.
Hence, as she has never been "divided" them, there is something acutely and particularly dangerous with ambiguous passages within the "UNITATIS REDINTEGRATIO" document contained amongst the various documents in the Second Vatican Council; this document gives one an almost certain [however, misguided or false] impression and notion that the Holy Catholic Church, which never lost her unity nor has ever been divided, is currently "divided" amongst Christiandom, as if the sundry Protestant sectaries where "elements" parts of the Holy Catholic Church [which they are not]."
It would then be in fact that they who are members are of those Protestant conventicles, whose members or forefathers stem from the initial schism of the Protestant rebels in their Rebellion from the Catholic Church some five centuries ago; or have separated themselves from the Catholic Church today [if they were members of her today by abjuring the Holy Catholic Church, seeking instead a particular Protestant sect that would then befit mostly with their own particular version of how "The Church" should be or "is;"] are not a part of the Holy Catholic Church having abjured her by either initial schism or by abandoning her by embracing Erroneous or heretical doctrine(s).
Leaving then the unity of the Catholic Church of God and here true and undefiled and pure doctrine and fullness of faith, for whatever sect they chose in her place, as if she were not the One True Church of God [which the Holy Catholic Church is most certainly the one true Church of Holy Saviour Jesus Christ], and the sect they joined was or apart of that "Invisible" Church of God that Protestants claim that "all true believers" belong to, contrariwise to the Catholic belief on the nature of the Church. They would then claim under the pretext of "Christian Unity" to "restore" that "lost unity"----a true unity which sadly to not realizing it, has never been lost, for such unity always was and is in the Holy Catholic Church of Christ's----their having abandoned such unity for the sake of their Reformed sects and their "reformation of Theology" in their Protestant "Reformation."
Now, with such a false concept or foundation in mind, many, forgetting that true unity has never been lost in the Holy Catholic Church, would be wont to [most regrettably, erroneously, and misguidedly] to adopt the Protestant notions of this "Lost Unity"---this "lost Christian Unity;" such Irenicism finds its way into the Pseudo-Ecumenism of today, causing a fundamental shift away from the fact that "true unity" WHICH remains only within Christ's Holy Catholic Church, as well as her being the "One ark of Salvation" as she is the only Church and vessel of salvation, wherewith one might attain salvation with, rather to a mistaken belief that the Holy Catholic Church is a "sect" or "denomination" like any of the sundry Protestant sects and should then adopt this Pseudo-Ecumenism. With this notion in mind many bishops, priests, and Cardinals adopt this false movement for Irenicism with not only the Protestant Sects, but also with the Eastern Orthodox and Oriental Orthodox Churches, glossing over the fundamentals differences in with such true doctrines as transubstantiation, Papal Authority and Infallibility, the 7 sacraments conveying grace, Sacred Scripture and Divine Tradition held together, as well as many others. Instead rather a false unity, built on the lost common denominator is put forward, to focus as were on so-called "core-beliefs" neglecting that fact that the whole Catholic Faith, pure and undefiled is "core" and necessary, and is as such our "Core-beliefs;" with which we cannot nor must not compromise.