Fast. Static websites can take a long time to generate when they start to grow large. obelisk should take advantage of Elixir's processes to increase this speed.
Simple, Obvious. It should be very straight forward to add new content and modify the way that your site works.
Templatable. It should be possible to store templates in github repos and reference them directly, allowing modification of the look and feel of a site instantaneously with no manual installation.