Paint sets are pretty neat because they separate the colors for all to see in a box of a specific range of colors. Place these bottles in a box and one doesn't know where the colors are.
The problem I find with Paint Set is that the box is often flimsy. Open one end and all the bottles come spilling out because there's no cardboard insert tab for instance.
Which begs the question...there are custom plastic boxes for paint bottles with foam inserts, but still, one sees the bottles from the top and I still have no idea what the colors are because I can't see the paint.
What needs to be created is a paint box that shows the colors from the side of the bottle, perhaps with a color chip so that one can insert bottles into the proper color chip slot. Recall that some modelers have more than one bottle of the same color, so having one slot of that color might be OK or not. It takes time to find the proper bottle with the proper paint in a box of bottles---there has to be an easier way.