True. I would love to have lossless images (and video) out of my devices still. Not as a replacement for RAW but as a middle ground between RAW and lossy JPEG.

Not for quality reasons primaily but because keeping the first stages of the processing pipeline and the archival branch lossless solves some headaches.

You are thinking of DNG which is more of a container format. It can use multiple image formats internally to record the actual image, one of them being JPEG-XL.

iPhone raw images are actually a jpeg xl inside the DNG.