I appreciate your input into this discussion and for the detailed information you’ve included. 
I’d like to clarify that I was in no way disappointed in CPMs reply and did not find him curt or abrupt in any way. I advised him of my use case and queried whether there would be any benefit to me in installing his build. He confirmed his view that there wasn’t and also advised that the fix for the bug affecting HDR playback had been incorporated into the nightlies when I asked him.
The exchange is here and runs over 4-5 posts Discussion
He gave me exactly the information I needed to make an informed decision based on my use case and I appreciated his replies.
I still follow this thread as it interests me and his CPM builds might be useful to me in the future if, for example I start to encounter HDR10+ material which isn’t available in Dolby Vision, I get a tv which doesn’t support Dolby Vision or it offers ongoing support when NG builds are abandoned.
I’m more of an ‘as the director intended’ kind of viewer and ‘on the fly conversion’ is something which makes me uncomfortable so theres no significant benefit to me at present but I appreciate the work done on this build and the benefit it brings to others.
Finally, I just wanted to check that the latest CPM builds were still based on the latest nightlies. The NG nightly thread had a post recommending the CPM build around a week ago as they said they were no longer based on the latest nightlies and were a workaround for the FEL bug (which has now been fixed).