[sinkspur]

How did Maniples and Birettas or the psalm Introibo and the Confiteor said at the Foot of the Altar get in the way of truth and right worship?

The Confiteor (as you know) is one of the optional penitential rites in the Novus Ordo. What is the purpose of the Introit or the Last Gospel?

They're just not essential. One could say the same about the Sign of Peace, which could be eliminated tomorrow AFAIC.

[ninenot]

The Introit sets the theme of the Mass. As you know, the Introit is "the entrance antiphon" and only if the Introit is NOT sung is there an "entrance hymn."

Of course, it was present in Rome in the early liturgies--THAT is provable, not speculative. But because a trained schola is necessary to sing it, and it remained in Latin, it was quietly dropped by neo-conservatives and Libbies alike.

[traditionalist]

They're just not essential.

The only thing essential in the Mass is the consecration and communion. Still, the Church Fathers and doctors all venerated inessential things such as the Roman Canon, offertory, Gregorian Chant, and the like. Up until Vatican 2, the Church always treated old, universally-practed and papally sanctioned inessentials with the utmost reverence, reforming them only rarely and incrimentally. Never before the 1960's was there such a radical and rapid purge of such inessentials. The post-Vatican 2 reforms are totally unprecidented.