(btw resolve doesnt need that much hardware you expect - its even less than after effects to work flawlessly

)
14bits --> 16bits, sure, the data has to be mapped which can lead to rounding errors
no, you just add 2 bits on the msb-side - the way, both cdng-converters work and made possible, to work with ml-raw files in resolve the last 5 weeks..
coming back to the primarly question -
resolve did it in the last update 9.15 - its reading 14bit dngs (from my point of view absolutely unnecessary fix - they should implement denoising, badpixel-operations and other things instead of implementing things, that community already solved)
adobeworld pretends it as picturesequence from dng's - dng is a adobe-invention and uses the acr-wrapper

it's not native - or better, its wrong to call it workflow, regardless of 8 or 16bit
adobe speedgrade - dng-support with 10,12 or 16bit files.
Sony Vegas able to work with r3d, but not dng.
avid xpress or media composer no dng-support.
and then? all other videoapps use the "till now" common bitdepths and videocodecs - cinemaDNG rarely supported
WHAT Programs are in our scope (in terms of cost)? nuke, scratch, mistika, pandora, lustre etc pp. ?
Davinci Resolve Lite is the only one, the independent scene is able to afford.. because its free.