We all edit different ways, I’m a commercial photographer and use the color labels for my specific processes.
I think this thread makes a decent case of how somebody chooses to do workflow, no need to nit pick on why.

That was my question too…

So my solution since LR v1.0 has been to select a set of images for export, then right after that, right click and set the color label to green. Now when I come back I look at the images that are green and skip right over those. (I could also filter by unlabeled and that would show me which ones were not green, but just the visual clue is enough to let me know where to go to resume my work)

I do sometimes use other labels … I might mark one red if there’s a problem that needs extra attention. Or purple if I created a virtual copy and did different edits on it. These are rare occurrences, but marking an image green after export is a daily occurrence for me in my workflow. I just wish LR had a built-in way to mark the images like it’s predecessor oh so many years ago did.

After each person;s picks, I use the Label filter to narrow it down to their shots — I make a Collection from those (like Client or Model), and then I return to the main shoot, so if the label changes now it doesn’t matter. I probably should have included that in the post.