Then nothing should prevent them from releasing the capability for LR6 as a point release, right?
Well, yes...sadly Adobe's quarter ended end of May and that was the cutoff for adding Dehaze to LR 6.1.
Going back to the reason that new features can't be added to an application AFTER the end of the quarter that the major release is released, that's why LR 6.1 can't get Dehaze...sucks, but that's the way it is. Revenue Recognition...it's a matter of accounting.
Mid June was after the end of Adobe's quarter that ended end on May. So, no new features (like it or not).
And no, it wasn't an Adobe conspiracy...it was less that optimal timing.
So, LR 2015.1 gets Dehaze (and Blacks/Whites in local) and LR 6.1 doesn't.
Sucks...but not a conspiracy, it's just unfortunate timing (seriously, no conspiracy involved).
I know some people want to blame Adobe and attribute this to a conspiracy to force people toward a subscription license, but Adobe seriously doesn't have the skills to do this. All they are trying to do is advance their offerings...with the subscription licenses, that's easy. New features get added as they become available. With LR 6.x, you won't get the new features till the next major version, LR 7.
This shouldn't coma as a surprise...