Up to our own times, it has been the constant concern of supreme pontiffs to ensure that the Church of Christ offers a worthy ritual to the Divine Majesty, ‘to the praise and glory of His name,’ and ‘to the benefit of all His Holy Church.
It is, therefore, permissible to celebrate the Sacrifice of the Mass following the typical edition of the Roman Missal promulgated by Bl. John XXIII in 1962 and never abrogated, as an extraordinary form of the Liturgy of the Church….(Read the Whole Thing) …(Father’s Z comments).
Also an EWTN special on Monday on the Motu Proprio.