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Very interesting info. Since I was not yet convinced of the claimed benefits of DNG, I have not invested much effort into the details. Based on your info, my conclusion is that DNG is complely useless at the moment and should be avoided at all costs.
If DxO cannot read DNG, it seems highly irresponsible for them to call their files DNG
I suppose some clarification is in order. DxO Optics Pro creates linear DNG files i.e. the file is demosaiced and all three channels are calculated as they would be in a 16-bit TIFF. Linear DNG files can be edited in any image processing software. On the other hand, the DNG files created by ACR/Lightroom/DNG Converter are non-linear and are not demosaiced so the file remains a combination of 12- or 14-bit sensor data and metadata. DxO Optics Pro cannot read this Color FIlter Array (CFA) DNG.
DNG is certainly not "useless." My catalog consists of images shot with several camera brands and models. The DNG format makes then consistent so I never have to worry if my Raw converter can handle a particular Raw file format.