I understand what you mean, this forum was just an example.Personal struggles of another person, marital relationship problems, encouragement for other believers in their spiritual growth, kids ministry - I believe these would be handled much better in a Church environment compared to online forums. This forum is a great place, no denying of that fact. You will often see people asking members to talk with their pastor for further guidance. Simply, we just don't know the other person personally.
It is undoubtedly essential to have face-to-face fellowship, but my point still stands that it doesn't need to be a "Church," it could be a small gathering of close friends.
I have reservations about fundamental "Church" dynamics, so we may simply disagree on that point for a different discussion.