Not trying to hijack a thread but to add a comment: We've had a production or two where they did shoot ARRIRAW and not ProRes. Some productions like the Alexa but it's lack of 4K is a deal breaker. But ARRI recently added "Open Gate" ARRIRAW which can record roughly 3.4K resolution. But it can't record this resolution to ProRes, only to single-file-per-frame ARRIRAW files.
I imagine @galakanokis is experiencing something similar with the .dng files. Productions/DPs want to record the best image possible and ignore the difficulties of post. So perhaps the times are changing.