It IS however possible to keep the DR in the DPX, even though you will lose precission.
The "Stay RAW/16-bit linear/EXR" for online advice is a good one too, if the people handling the files have the right software and knowledge.
You need to get the info out in float from the Rocket, though to take full advantge of that. And the software itself needs to work in "true" float, if not you get a lot of info is easily capped away in the "red room" or whatever the meta-stage is called.
Often, a well developed DPX @ redlogfilm will have better practical value - as it is known - when people are in a rush and projects needs to get finnished.
If you are an all-red house: RAW is a no-brainer.