In fact, C2 was supposed to support multiple exporters during its early plannings, rather than just HTML5 (...)
Admittedly, I missed the early adopter phase and have no CC background, so I have no idea what C2 was supposed to be in the beginning. When I bought in Sept. 2012 I was looking explicitly for a HTML5 engine and it was relatively clear that native directx was off the table.
But if as you say this evolved from another announcement entirely, I can partially understand the frustration that some people seem to experience.