I believe this is the reason DxO stood down on iOS RAW: comparing their work to what Apple does internally within the phone would be unfavourable to DxO. I almost never shoot RAW any more on my iPhone 11 as the RAW files are mediocre and the Apple processed jpegs so much better. One issue with processing RAW from iPhone 11 Pro is that Apple’s processing (which allows native HDR) is so much better in mixed lighting than anything which can done with the RAW file. iOS RAW such is used by Moment Pro Camera or Halide is another matter.
HEIC is not at all necessary (there is no extra information in there, no 16-bit file hidden) and software publisher licensing fees are very onerous. DxO PL 4 released today has absolutely no news about this.