could you please explain the benefits of Luminosity Masking
Certainly. Luminosity Masking provides the ability to create a mask that contains only the brightest or least bright parts in an image, and so allows you to make adjustments to only those parts. You do something like this when you adjust the Highlights, Shadows and Midtones in an image but the ability to create a Luminosity Mask usually also gives you the ability to adjust just how bright or shadowy the selected parts are, and sometimes which color you want a LM for.
In addition, a properly created Luminosity Mask changes from those parts of the image that are included to those that are not included gradually so generally there are no sharp edges to the mask and things look normal after an adjustment instead of there being a distinct border between light and dark. You can see how helpful that is by using the graduated filter in the PL Local Adjustments. The changes you make are gradual and look more like the normal world.
I have found this type of adjustment to be very, very helpful, but I have to use Photoshop or Affinity Photo to create the masks and then do my adjustments in that editor, but recently most other workflow tools have added LM functionality to their basic set of adjustments so I was wondering if PhotoLab had any plans to add it as well. The Nik stuff is nice, but I do not see how to use it for this type of work.