Great question. This is our first release, and we will be fleshing out features, here are a couple of advantages to our approach. We will be able to have much finer grained sharing than is possible with VNC. Eventually you will be able to publish a single interactive plot, or a single environment to collaborate on. For many new users, VNC is a non starter because of the setup involved. VNC works really well for controlling a single computer, but it doesn't help you much with managing clusters, python execution environments, sharing or many of the other things that we are doing with Wakari.