UWP feature gap: HDR composition

[benstevens48]

UWP apps supported HDR content using CompositionDrawingSurface with a 16-bit floating point pixel format. However, WindowsAppSDK does not seem to support this - such surfaces are just converted to SDR (presumably rendered to an 8-bit swap chain or something). Please correct me if I'm wrong. I tried to raise an issue about this - #6291 - but it was immediately closed in favor of an 8-year old issue that's not quite about the same thing and that is obviously never going to be addressed.

I would have thought that there was a policy to close feature gaps with UWP - especially if it's a feature like HDR which will become more common. Is this not the case?