conitec cvan't find the bugs, when they program and tets it's ok for them.
We are the best way to debug with betas versions

And i think conitec guys have more important features to do than wasting months in a demo.

One thing that could be done i think , would be not a playable demo, but a running demo showing featues of the 3D engine.
A demo that would play in chain different little scenes and effects.
that way every guy of the community could bring some little scene to add to the demo.
For example a house in a terrain with water shader and normal mapping on the house (the camera would travel to show all that closely).

Well , i don't think the demo is really necessary !