From Michael Silhavy at Twin Cities Mass Settings:
Many of us are “using” the release of the Missal to accomplish many things. And there’s nothing wrong with that. Some are using the release of the Missal to establish uniformity in sung settings at all Masses, whether it be in a single parish, a region, or even a diocese. Some are using the release of the Missal to teach brand new music; others are using this opportunity as a time to discard old settings and bad musical habits. Some are using this time to catch up on GIRM or RS implementation. Some places will use the implementation as a way to introduce more dialogical singing. Catechesis on the Mass is happening all over the place because of the release of the revised Missal. These are all good, honest things.
But I’ve heard of some who are using the release of the Missal as the excuse for implementing their own personal wishes. “The new Missal asks us to eliminate hymns in place of chant.” “The new Missal wants us to sing more Latin.” “The new Missal demands that only the Grail translation of the psalms be used.” (Now there’s a whopper.)
A parish, more properly a pastor, is free do as it/he wishes in many matters. A parish can forbid music by a certain composer. A parish can choose not to use certain musical styles or instruments. Heck, a parish can outlaw all music in D Major if it wants. But don’t say things are being done “because the Missal demands it.” Be honest.