“But not the other two. “
Yes on the other two:
One: It simply includes additional information regarding the HDR effect that compatible sets can implement. The broadcast is also backwards compatible with older standard dynamic range images should the set not offer HLG compatibility.
While HLG is still years away from any mainstream rollout, there’s nothing about the spec that would prevent any HDR set from offering a firmware update to support it later on.
The Other: it’s also primarily built for broadcast media and upscaling SDR video to HDR. But it’s designed to be cross compatible across different HDR hardware, making it likely that TV manufacturers will be able to support it.
And now you’re back to the original assumption from the article, hoping the manufacturers will support multiple formats and update their firmware. Which we know they will not. Thus the article, and yourself are wrong. If you guess wrong you WILL be on the outside looking in, having paid for HDR and only getting HD. You admitted it already yourself. Don’t know why you still want to argue. We’re done, have a great day.