Too many people approach Western Rite in the Eastern Orthodox Church as a theoretical exercise. One often hears (pro and con) statements about historical continuity or non-continuity, Frankish-influence issues, minutiae (e.g., what kind of vestments Eastern rite clergy should wear, when attending Western rite services), and so forth.
Oft bypassed by the non-Western-rite observer is that WR Orthodoxy faces more immediate, practical concerns: how to acquire and adorn a chapel; how to get vestments made; how to marshal a choir; and, of course, what to use for liturgical texts.
In the Antiochian Western rite in the U.S., this latter question has been largely decided and is currently settled. It is an essentially dual approach (Tridentine-Roman and traditional Anglican), avoiding pre-Reformation liturgics on the one hand, and the latest modern developments on the other.
In the Russian Orthodox Church Abroad, the liturgical question has not been settled definitively. Usages currently blessed include three versions of the Roman rite (Tridentine, Sarum, and Mt.-Royal) and traditional Anglican. None of these has been identified as an exclusively prescribed usage, and there has been no attempt to impose liturgical conformity. That might be a good thing, since it gives the hierarchy time to observe and assess what works and what doesn't.
The Romanian Church has parishes using a theoretical reconstruction of the lost Gallican rite, a usage kept in France in the 1960s under Abp. St. John Maximovitch. This represents yet another strain of liturgical usage. And there is potential for use of the Mozarabic rite of Spain, the Ambrosian rite of Aquileia, as well as liturgies of the Roman-Catholic religious orders.
Speaking of St. John Maximovitch, he blessed for use both Gallican and Roman rites.
It must be admitted that the "Which Rite" question remains unanswered, if one is speaking of the Orthodox Church as a whole.
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