Mediator Dei continues with concern about the recovery of ancient rites.
61. The same reasoning holds in the case of some persons who are bent on the restoration of all the ancient rites and ceremonies indiscriminately. The liturgy of the early ages is most certainly worthy of all veneration. But ancient usage must not be esteemed more suitable and proper, either in its own right or in its significance for later times and new situations, on the simple ground that it carries the savor and aroma of antiquity. The more recent liturgical rites likewise deserve reverence and respect. They, too, owe their inspiration to the Holy Spirit, who assists the Church in every age even to the consummation of the world.[Cf. Matt. 28:20] They are equally the resources used by the majestic Spouse of Jesus Christ to promote and procure the sanctity of (humankind).
Ironic the criticism of the sensory appeal of the very old. These days doubtless few are quoting MD 61 about respect for more recent rites, the inspiration of the Holy Spirit, and even the goal of the sanctification of people–not just believers.