There is going to be a limited amount of space in tasksel for blends, given current debconf UI constraints.
I think that using popcon as a rough pass to select the blends makes rather a lot of sense. The "Debian Pure Blends" effort has been around for several releases and been publicised. The individual blends have had time to find users, or not. If there is some new and upcoming blend that makes sense to promote for a while, it might make sense to disregard the popcon numbers for a while. (Of course, you want to read the right column in the popcon output, in particular the number of installs, not number of metapackages in use, which tends to be 0.) -- see shy jo
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