I do hope you end up spending more time in Adobe XD. There is a lot more than the sample file shows you especially in the Design surface as well as in importing of assets. You can see what others have been starting to build with just this first release and started posting on Behance.
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I admit that we do have a lot to build, but, we believe there are a lot of use cases served by this first preview. Here is a quick tutorial I wrote up about various ways to get content into XD from Illustrator, Sketch, Photoshop or the browser.