Maybe the demo hints at some things still to come in a Terrinoth campaign setting?
The core book has fairly extensive hacking rules, which is unexpected but makes sense as there is already a system-free setting book for Android. The core book needs to do more of the heavy lifting.
When they release a fantasy book I’m sure it will contain more crunch in addition to fluff. Signiature spells and heroic abilities could easily be an example of that.