This is why I am personally so interested in the HDR metadata being passed by OSMC. I am running a JVC RS2000. The Auto Tone Mapping feature makes a significant difference when it is passed a source that has proper metadata, since projectors are not generally able to display the full range of HDR brightness. Otherwise the user needs to tweak the gamma levels themselves per movie. I have had excellent results with the Auto Tone Mapping on sources that provide proper metadata.
For the record, of course there are many UHD titles that don’t provide any metadata, and there’s nothing that can be done there, but the ones that do should be supported.