Actually, DNG makes for a robust delivery format. No worries about keeping the files and the .xmp files together.
I agree with this. And I was all for DNG when it first appeared and have flirted with it ever since. Not having the sidecar XMP file would be nice, though I usually handle files within Bridge or Lightroom which move them with the files or on a folder basis where it also is not an issue. But non-Adobe converters handle the native file better than a DNG from the native file. I would think they would be able to read the camera information from the DNG and process appropriately, but apparently not.
It would be a blessing if the entire industry could get behind a full featured file format for RAW files! Hell, I'd take something like MKV for video files. Stuff whatever you want in the container and let the decoder figure it out.