1 Corinthians 16:17

I am glad of the coming of Stephanas and Fortunatus and Achaicus: for that which was lacking on your part they have supplied (KJV)

Then: Corinthians probably did not read this as a criticism. Other translators soften the meaning to Paul's being grateful for the help these three have given him while others in Corinth were just unable to come. Travel was not an easy task in those days. Taking the effort to bring Paul a status report was an exceptional event (Baker, p. 247). The biblical record shows no other church doing the same thing.

Now: Sister congregations use newsletters, denominational journals, annual conferences, Bible college contacts, member visits to other churches to find out what's happening. They learn ideas as to what works and what doesn't.

Extra Source: Cornerstone Biblical Commentary 1 Corinthians (William Baker), 2 Corinthians (Ralph Martin & Carl Toney), ed. by Philip Comfort. Carol Stream: Tyndale House Publishers, c2006.