The point of using lightroom is Cataloging and RAW photo development. I can't see what's useful since the hyperbole mentions Lightroom. It's a program to develop RAW's (Even the name of the application is a pun on that)
Polarr dev here. we're very interested in bringing raw in the web and if there is a possibility of decoding and editing raw properly, we're either the first to do it or it will become some sort of commodity supported from the browser layer.
Great, a good low-cost feature in the meantime would be useful messages when trying to import unsupported or corrupt files, seems nothing happens now?