Honestly the best argument for uncompressed is actually nothing to do with file quality or loss - it's that Apple only supports uncompressed Fuji RAWs.

You cannot preview or process lossless compressed Fuji RAWs on iOS natively but the uncompressed files are equal to Apple's own RAWs in support. On the field, it is sadly worth every byte to be able to grab a file directly off the camera and tweak it or send it to an editor. :/