Thanks for that.
From the same link:
Basic concepts and themes like Sacrifice and Redemption, Mission, Proclamation and Conversion, Adoration as an integral element of Communion, and the need of the Church for salvation--all were sidelined, while Dialogue, Inculturation, Ecumenism, Eucharist-as-Banquet, Evangelization-as-Witness, etc., became more important. Absolute values were disdained.
(My emphases - JD)
That is the crux of the problem. We now have two main factions: those who view the Mass as essentially a meal and those who know it is essentially a sacrifice. All other differences, liturgical, musical, stem from this.