Paul's method of evangelism. He would go to a large community preach, get converts, teach them to meet weekly or even daily and they became the church in that location. They then could continue to reach out to the people around them. Paul would go to another community and do it again. He addressed them as the church in that location in his letters. So did Jesus.
It's a biblical concept. Revelation 1-3. A local church is viewed by Jesus as the church in that location. Jesus himself called them
churches. The seven churches. The angels of the seven churches. Paul talks about "the church at
location" and many other references to churches.
We should continue this method of evangelism because it works. Find a community (the bigger the better, because it is about winning as many souls as possible) that needs a church and start having some kind of meetings, whether it is a home fellowship, or a storefront, or a hotel ballroom, school auditorium, or many other ideas and start a local fellowship that can continue reaching the community with the Gospel. Then go to the next community that does not have a soul winning church and start another one. Keep doing it until Jesus comes back again.
Yes they are all one church. But they are also individual local churches and that is a biblical description. I did not make it up.