Perhaps many of us don't use / don't allow remote image hosting?
I agree however that using images in forums needs improvement and even with image attachments like I use at my site, version 2 was superior to version 3. In version 2 clicking on an image attachment opened the image in a new window. If you had multiple image attachments then you could open them all for comparison if you wanted to. Now it's either using Lightbox or Lightbox disabled. With Lightbox disabled image attachments open in the same window so doing image comparisons is no longer possible. Then if you do use Lightbox you can't save images and you can't do image comparisons.
Then of course there's the issue of no image size restrictions either for remote hosted images or image attachments.
IPS needs to tidy up the use of images in posts before adding fancy new enhancements.
3DKiwi