Actually those Churches in the NT had bishops appointed -- they may have been held in homes of people but they were not "home churches" in the sense of people just pick up a Bible and teach (as opposed to praying, expressing their love of God, reading together) can lead to the various questions like "is there a Trinity" etc
The problem with these "home churches" in fact is that they lead to heresy as we see in the NT with the heresies I pointed out before