sphinx ports are not hard dependencies of anything else in the collection. It seems like their only purpose is to build documentation, when the upstream project does not ship pre-compiled man-pages.
Recommendation: mark unmaintained
dia, the hfs utils, and
leveldb are getting only minimal attention (if any) from their upstream developers.
streamlink seems more active, and hence a good candidate for adoption (along with its python3 dependencies) if anyone is interested.
midori are unwieldy to build from source. Adopting either of them would almost require a dedicated build farm, either to keep up with the cadence of its releases (firefox) or its electron dependency (midori).
librsvg-compat is still mentioned in
/etc/prt-get.aliases as a viable substitute for
librsvg, but it has not received back-ported bugfixes for several years now. Its dependency
libcroco is not needed by anything else in the collection.
Recommendation: drop, or move to contrib.