If someone is still interested in the topic, here it is the list of dependencies required by the meta-package *kde-standard* (a dependency of *task-kde-desktop*) with my suggestions on the right.
kde-standard Depends: akregator --> change to: Suggests Depends: ark Depends: dragonplayer --> substitute with: vlc Depends: gwenview Depends: juk --> change to: Suggests Depends: kaddressbook --> change to: Suggests Depends: kate --> change to: Suggests Depends: kcalc Depends: kde-plasma-desktop Depends: khelpcenter Depends: kmail --> change to: Suggests Depends: knotes --> change to: Suggests Depends: kopete --> change to: Suggests Depends: korganizer --> change to: Suggests Depends: kde-spectacle Depends: kwalletmanager Depends: okular Depends: plasma-dataengines-addons Depends: plasma-pa Depends: plasma-runners-addons Depends: plasma-wallpapers-addons Depends: plasma-widgets-addons Depends: polkit-kde-agent-1 Depends: sweeper --> change to: Suggests Breaks: <kde-minimal> Recommends: konq-plugins --> REMOVE Recommends: plasma-nm --> change to: Depends Suggests: <kde-l10n> Suggests: skanlite Comments and suggestions are welcome. I'm planning to submit a bug report (as a wishlist item) in the next days to see if the issue can be discussed with the maintainers and if something can be done in time for the release of Stretch. Francesco