Using two or three RAW developers long term is anti-productive. One doesn’t develop real expertise in any of them. I recently experimented with Iridient Developer (which I did use as a primary RAW developer for three years) and Affinity Photo. I.e. these are programs with which I do have some familiarity. My PhotoLab 5 iPhone 11 Pro DNG turned out much better in PhotoLab 5. Part of it was the merit of the program, part of it is that I’m fairly expert in PhotoLab 5 at this point and can take good advantage of the colour profiles and of the local adjustments, even working quickly.
Moreover, Nikon NX is yet another iteration of SilkyPix which is really nothing special. It’s main merit are the custom Nikon colour profiles direct from Nikon.
Changing the Camera Model with MetaImage or ExifTool is far simpler than learning another RAW development tool.
How about instead DxO set itself a goal of providing new camera support much more quickly and build up some trust from both existing PhotoLab photographer-customers and potential PhotoLab customers?