Rather it is an invitation to open content publishers to be thoughtful in the technical choices they make - whether they are publishing text, images, audio, video, simulations, or other media.
I am still trying to wrap my head around how you make images open and meaningfully editable. For instance, if I create a graphic or diagram, I would do it in InDesign, illustrator, or Photoshop. Typically these files are built in layers, with different effects, transparencies, etc. The files are huge. I would then have to flatten the layers and reduce the file size to make the graphic workable in an online, or even printed environment. Once flattened, they are no longer editable.