Since most of the time objects are directly pushed for release instead of callbacks, it makes sense to optimize this case by not storing the object in a callback and removing the call to the virtual Release method. The virtual destructor does the job here.
This changes makes the whole rendering independent from the RenderFrame acquired from the Swapchain.
This may allow to do offscreen rendering (= without swapchain), or multi-window rendering in the future
SirLynix