Many people dismiss these churches as just churches and object lessons.Revelation 1:
19 “Write, therefore, what you have seen, what is now and what will take place later. 20 The mystery of the seven stars that you saw in my right hand and of the seven golden lampstands is this: The seven stars are the angels of the seven churches, and the seven lampstands are the seven churches.
But they are more. The seven lampstands (representing covenant in the Bible) are not just for these specific churches of that specific time. They also represent the seven periods of the Church Age with the dominate attributes of those times.
They also show the problems that develop in churches over time and their culmination into what we see just before the Rapture.
In each church is include what hostorical time period they represent.