The Catholic Church uses the word "church" in two ways, to mean either: the "local particular church" ("diocese"), that is, the church under its bishop or equivalent; and the "autonomous local church" ("rites") with its own customary liturgies and canon laws, and often, language, such as the Chaldeans, the Melkites, the Maronites, the Armenian Catholic Church, etc.
All the particular Catholic Churches — eastern or western, autonomous (rites) or local (dioceses) — are by definition in full communion with the See of Rome.
So here's my question: do you think these seven churches of Asia were local churches in the sense of dioceses?
Bless your heart. Only those called by God, born from above, and indwelt by the Holy Spirit are part of the ekklesia of Christ. It includes all of those "called out" throughout history. That is the invisible ekklesia as only God knows who they all are. The local "assemblies" are members of the universal ekklesia and are the visible part of that ekklesia. Christ is the head of that ekklesia and present with them when meeting with as few as two or three. There is no single earthly organized hierarchical structure such as the Catholic Church would have you believe.