And one more point: in Roman rite there is in fact just one mass but in Byzantine rite there is Liturgy of St. John Chrysostomos, St. Basil the Great, and Presanctified Gifts.
that’s actually not quite true. Re Byzantine, you left out the Melkite’s use of the Liturgy of St. James. And you also left out mention of the Hierarchical Divine Liturgy, which is as different from the normal St John’s as St. John’s is from St. Basil’s.
For the Roman… There is the pontifical mass (hierarchical DL equivalent), then the normal mass, and there are some subtle differences, plus there are 12 approved anaphorae for the Roman Ordinary Form; all of which can be used in either the pontifical or ordinary masses.
Plus, there is the Anglican Use, and the Extraordinary Form (with 4 distinct uses: Low, Sung, Solemn High, Pontifical High), all of which are considered to be part of the Roman Rite.
And then there are the other Western Rites - most visibly, the Mozarabic, Ambrosian, Bragan, and Dominican, but also the various monastic rites which few ever see, each with distinct liturgies, and in the case of at least the Dominican, multiple uses within paralleling the Roman - Low, Sung, and High masses, each with distinct rubrics.
And then, there are some interesting western wierdnesses:
the Dominican Use of the Roman OF Mass is Dominican rite propers used with the Roman Ordinary Form.
The African Use has different rubrics on posture.
The Yupiq use has a couple unique prayers, because certain prayers cannot translate into Yupiq.
The Dalmatian Rite was a spur off the Roman, but using Old Church Slavonic instead of Latin, and dating to the 9th C. It was resynched to the Roman in the 17th C…