What my church is or is not as what is exampled by the earliest NT church is not the question, nor should it be brought into the discussion.
It is merely a distraction.
The question of this thread has to do with the assembly of believers who meet in single location in which the leadership is not selected by THAT assembly and to which the leadership is not held accountable in all manners of faith and practice to THAT assembly.
There is actual Scriptures that state the qualifications of the leadership of the LOCAL assembly, and there is never a time when it included multiple assemblies from different geographical areas which meet in worship.
For example: The church of Corinth had no authority over the church of Ephesus.
The ONLY time a church was considered OVER the others was that of the Apostles church in Jerusalem.
Even then, there is not one Scriptures that express that the Apostles were "over" the local assemblies in general.
That they were is assumed because of Paul's traveling to Jerusalem to present a question to them for their consensus.
This is simply not true. There were independent meetings in various houses at different times. I'll trace the evidence for you in a bit, but no reasonable scholar doing work in this period thinks this is true. The churches across the Mediterranean region had differing approaches, but the house church remained the primary congregating form for the first two hundred years of Christianity. No buildings were built prior to AD 300.
This is an erroneous understanding of what we're talking about. Though I don't believe you can find the modern instantiation of multi-sites directly in the NT, the idea of multiple assemblies as part of a larger regional/city church is clearly evident in the NT. Most modern forms of worship and ecclesiology are several steps beyond the NT ecclesiological presentation. That's fine, there is no singular ecclesiological form, of leadership and assembly, presented in the NT.
Wel, one this isn't a scholarly source but a tourist site. Secondly, I read the article and there isn't a basilica present until (quoting the piece) His Basilica was built in the 6th century by Justinian I.
I'm not sure what your point is here. However, there are few surviving Christian structures from before AD 300. None of which bear the marks of large assembly halls.
I disagree with this, but likely for different reasons than you're anticipating. Perhaps too much of our current ecclesiological methods are speaking into how the NT expression of ecclesiology is understood here. The churches in the NT didn't just meet on the "Lord's Day" but throughout the week as well. They celebrated the eucharist and received instruction during these times. Pastoral staff, or elders (depending on which author we're reading), were part of these assemblies.