There’s no chance of those weird pattern artefacts. Other kinds of artefacts, well, that’s different. 
But seriously, all highlight reconstruction is guesswork. The approach we are taking, splits clipped areas into patches and tries to guess the correct colour for that patch. The most obvious artefact is when the guessed colour is completely wrong.
A large patch of the wrong colour should be more easily corrected with other tools than weird patterns and smudged colour.
I am still hoping an RT dev takes up the effort as well.
Nope - not yet 
This stuff is overall a difficult beast. We are still sorting out “how to do” in the algorithm and have to keep performance controlled.
Yes - there will certainly be a pr later, a wild guess would be soon after 3.8 release.
And yes - personally i already use this for my daily photo work
OK, thanks!
Arghhh, that’s teasing! 
You could open a draft PR on GitHub so people could find the bugs more quickly 
Atm it’s not about bugs but concept 
@Iain Hi, I am trying to implement some “good enough” highlight recovery algorithm into my tool www.photopea.com . Is it possible to get in touch with you somehow? My email address is ivan.kuckir@gmail.com