In the past, we were forced to include these now-removed projects because too much of the eco-system depended on them. Now that’s no longer the case, we don’t feel they pull their weight anymore.
Maintaining the community build is a large investment, and inclusion in this list needs to be earned, both on technical and social merit. On both counts these projects fall short of our bar: they have become a small island in the dependency graph, and the negative sentiment generated by a few very loud scalaz maintainers is damaging to the community.
Of course we will continue fixing bugs in the compiler if these projects discover and report any regressions, but we feel the coverage of the community build is sufficient as it stands, and it would be unlikely that we won’t have already caught the issue thanks to the remaining projects.