High Christology as a doctrinal stance was not enough to prevent the eventual apostasy of those in Asia Minor. Doctrine must produce the right conduct.
Paul's use of the presence-absence dichotomy clarified that absence does not materially affect the Work of God because the same Holy Spirit is always present.
Each of the letters in Revelation 2 and 3 speak of overcoming. By examining those churches, we can understand what we are up against and what we must do.