The only truly multi-ritual communion

Got this insight from Samer al-Batal: the Miaphysites — Copts, Ethiopians, Armenians, and Syriacs including in India — are the only fully multi-ritual communion, barely a communion as these are churches each with their own respective rites and little to do with each other. They don't normally operate on the same turf — only overlapping in diaspora, in the West, particularly America?

The Catholics come close but:

An Armenian priest doesn't adopt Coptic practices for example in the name of the universal church and being closer to same.