I see it differently.
UHD Alliance and corresponding certification was created to address BS claims "supports HDR". But it only applies to TV appliances.
VESA has created another standard that covers monitors (including those on Notebooks).
"Form of mapping" exists not because someone misfired, but because it's the better way to display contents, an alternative would be "let us pretend it's always 1000 nit max".
With current standard devices can dish out whatever they can, be it 1000 nit, less or more, entire range can be utilized.