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Are you speaking of wayland or directfb?
Because directfb exists since more than 10 year.
The main problem IMHO is the fact that unlike wayland, it does not receive the support it merits from other...

I think (correct me if i'm wrong) the main difference is that directfb is shipped as a standalone library when Wayland does require the presence of a compositior in order to work.

DirectFB is accelerated by itself. It access directly to your video card and it does not rely on other library for that.

From the DirectFB website:
DirectFB is a thin library that provides hardware graphics acceleration, input device handling and abstraction, integrated windowing system with support for translucent...