Dear @John7
I don’t know how many licenses of Mac/Win versions are sold by DXO, but I think even today a lot of people are interested in graphic software, teaching stuff like Adobe or Affinity software will work on Mac.
After 35 years with windows, I decided this year to give Mac a try, and there are a lot of workflows i prefer with Mac. But sometime I also desperate with some things, especially the context sensitive work with objects. But I think my learning curve has some place for improvements 
And for me at the moment windows is still my main operating system.
I can not understand why the differences between Mac/Windows are so great working with DXO. I own also Affinity Suite for Mac/Win and here are the differences almost negligible.
Watching a tutorial where the tutor owns Mac I can follow all the steps on Windows.
Also what platypus in the post How to use PhotoLab on multiple Apple Computers - #69 by Joanna has found out, leaves me a little perplexed and thoughtful.
It almost sounds as if there are not two development departments here, but 2 different companies working on the products.
This is also one of the reasons why I decided during the beta test not to work with DOP, XMP inside DXO, but to use only the RAW tools.
Maybe everything will change for the better with version 6
greetings