Adobe’s DNG converter is presented as " …The Adobe DNG Converter, a free utility that converts files from more than 350 cameras to DNG, enables you to easily convert camera-specific raw files to a more universal DNG raw file."
ref : Adobe Digital Converter
If DXO Photolab and PureRAW accept all DNG files exported by Adobe’s converter, then DXO becomes usable on a wide variety of cameras.
There are several threads asking for full DNG support by DxO. At the moment DxO only support a subset of DNG if it has come from a camera specifically supported by DxO. So if the DNG is from a camera or scanner, or generated by Lightroom without the profile of a Camera DxO supports then PhotoLand won’t read it. A pity. Untill it does the organisations I work with won’t be moving to PL 6. We have older versions.
The worst of it is, for example, if you modify the Exif code of a samsung DNG file and you replace it by a supported Apple iPhone, then DXO Photolab accepts the DNG file and works very well, including DeepPrime !
A minimal amount of support is easily feasible by DXO ! Who cares if the lens is not perfectly characterized ? DxO Photolab already supports camera-lens combinations where there is no lens data for full support.
This is a long story with DXO. I found out a couple of years ago that changing the EXIF data associated with the DNG file solved the problem – mostly. I used this with Fujifilm X-Trans RAF files converted to DNG with Iridient. That might indicate some DXO products are using a lookup table, since I used the same camera brand (Sony) and model information data in Iridient for converting RAF files from the Fuji X30, X100F, and X-T3. You do lose the lens correction.
The DXO position is that it is better for you to have 0% capability with regards to externally converted DNGs than it is for you to have 95% capability. This is reinforced often by the DXO apologists on this forum.