It’s useful if you want other things to depend on your package.
If you want to create a Voronoi diagram in another project in a separate environment, using dev will allow you to use VCLR as a dependency.
This is partly what I was saying above about how it’s odd you have VoronoiCLR and a bunch of sub-folders. Are you sure that the subfolders VCLR, CLR etc. shouldn’t be in their own folders? Then using them inside VoronoiCLR, itself a separate folder? Where you dev all the modules you made inside the VoronoiCLR environment.