OK, this will be a long one. In the 2 years since I first posted this feature request a few things have changed in my workflow. Before, I liked to do my color grading in Capture One before exporting a tiff for skin work, etc in Affinity Photo. I now like to not have the color grade baked in, so that I can easily change it without losing my skin work. I could always just export from Affinity Photo back to C1 to do my color grade at the end, but it would be much more helpful if I could intuitively and quickly do my color grade in Affinity Photo.
Below are 2 videos showing the difference between color grading in C1 and Affinity Photo for me (no retouching has been done yet, so please don't judge image). As you can see, C1 makes it much easier to preview looks I've created using the Color Balance tool, as well as create new looks on the fly. I know that I could save looks as luts or whatever and preview that way, but that still leaves the creation process, which right now for me, consists of a 6 node gradient map for highlights, shadows and midtones. As you can see in the second video, this is not intuitive at all and definitely not fast.
Also, I already have these layers created in advance and have the blend options set for each layer, otherwise this video would be easily double the length. Even with this process, I still can't control the luminosity of the highs, shadows and mids within this color grade stack. I'd have to add 1 or more adjustments to do that separately.
Panels like the Infinite Color one from Pratik look to bring similar functionality to PS, but as I understand it, these panels will most likely never work in Affinity Photo. As mentioned in my last post on this subject, Pixelmator Photo for iPad now has a similar tool to C1 and it would be great if Affinity Photo could provide this ease of use to color grading. I'd especially love if the iPad version had this as it is my main retouching/color grading platform.
Anyway, thanks for reading/viewing. If there are any more questions I can answer about my suggestion or process, please let me know.