This is why it is very important to observe the essential criteria of the Constitution on the Liturgy, which I quoted above, including when one celebrates according to the old Missal!
More Perfect Worship [Note: this header is not in the Latin text.]
23. The primary end of general participation is the more perfect worship of God, and the edification of the faithful. Thus the various means of congregational participation should be so controlled that there is no danger of abuse, and this end is effectively achieved.
b. Participation of the faithful in sung Mass.
24. The more noble form of the Eucharistic celebration is the solemn Mass because in it the solemnities of ceremonies, ministers, and sacred music all combine to express the magnificence of the divine mysteries, and to impress upon the minds of the faithful the devotion with which they should contemplate them. Therefore, we must strive that the faithful have the respect due to this form of worship by properly participating in it in the ways described below.
25. In solemn Mass there are three degrees of the participation of the faithful:
a) First, the congregation can sing the liturgical responses. These are: Amen; Et cum spiritu tuo; Gloria tibi, Domine; Habemus ad Dominum; Dignum et justum est; Sed libera nos a malo; Deo gratias. Every effort must be made that the faithful of the entire world learn to sing these responses.
b) Secondly, the congregation can sing the parts of the Ordinary of the Mass: Kyrie, eleison; Gloria in excelsis Deo; Credo; Sanctus-Benedictus; Agnus Dei. Every effort must be made that the faithful learn to sing these parts, particularly according to the simpler Gregorian melodies. But if they are unable to sing all these parts, there is no reason why they cannot sing the easier ones: Kyrie, eleison; Sanctus-Benedictus; Agnus Dei; the choir, then, can sing the Gloria, and Credo.
Recommended Chants [Not in the Latin text.]
In connection with this, the following Gregorian melodies, because of their simplicity, should be learned by the faithful throughout the world: the Kyrie, eleison; Sanctus-Benedictus; Agnus Dei of Mass XVI from the Roman Gradual; the Gloria in excelsis Deo, and Ite, missa est-Deo gratias of Mass XV; and either Credo I or Credo III. In this way it will be possible to achieve that most highly desirable goal of having the Christian faithful throughout the world manifest their common faith by active participation in the holy Sacrifice of the Mass, and by common and joyful song (Musicæ sacræ disciplina: AAS 48 [1956] 16).
c) Thirdly, if those present are well trained in Gregorian chant, they can sing the parts of the Proper of the Mass. This form of participation should be carried out particularly in religious congregations and seminaries.
On the subject of violating the rubrics in the Ordo of Pope Paul VI, how is it actually possible to violate rubrics with so many options?
"As to the matter there can be no doubt; for, whatever pertains to Divine Worship has always been considered grave matter, and the solemn will and intention of the Superior is made clear from the tenor of the laws." (P. Florentius Romita, Jus Musicae Liturgicae, Edizione Liturgiche, Rome, 1947).
respect must everywhere be shown for the feelings of all those who are attached to the Latin liturgical tradition, by a wide and generous application of the directives already issued some time ago by the Apostolic See for the use of the Roman Missal according to the typical edition of 1962
To substitute for the Mass prescribed in the Calendar another Mass at choice would normally be a venial sin, but if great scandal arose or there was contempt or serious negligence, the sin would be a grave one.
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