There is such a thing as taking excessive liberties. Have you ever heard of the Neocatechumenal Movement? They thought that they had carte blanche to do whatever they wanted to with the Mass, operating under the same premise that you just stated. It wasn’t at all okay with the Vatican and Pope Benedict had to personally intervene. He also had Francis Cardinal Arinze make sure and tell the movement that it wasn’t just the Holy Father’s personal opinion, but, it was a matter of liturgical law that had to be followed.
Furthermore, I repeat my challenge to those who think that they can justify the kind of music used at LifeTeen, as well as other instances where some advocate pop and jazz. Re-read the quotes from the Fathers of the 2005 Synod on the Eucharist, Pope Benedict’s exhortation in Sacramentum Caritatis and what Pope John Paul wrote about music two years before his death.
Not every piece of music is suitable for the Holy Sacrifice of the Mass. Even Pope Paul VI, the author of the Pauline Missal which is now the OF noted that not everything that crosses the threhshold is suitable for the Mass. And, this is coming from the Pontiff who concluded the Second Vatican Council.