@sophie-h
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The current definition of <project_group> sounds somewhat similar to what in GNOME is called "Core apps" or "official GNOME software."

A quick check of Flathub gave me the following usage stats for <project_group>

GNOME:    167
KDE:      144
Pop!_OS:  1
Qt:       7
Solarus:  1
XFCE:     2

At the same time, there currently exist only 29 Core apps in GNOME and only 20 are on Flathub for technical reasons.

I don't think it's realistic to roll back time with the use of this tag. I would suggest one of the following

  1. Adapt the meaning of the tag in the direction of "fits into the ecosystem of KDE, GNOME, ..."
  2. Deprecate the tag and create new tags for 'part of ecosystem' and 'official XXX app'

But those are just some quick ideas

/cc @bertob

Is there someone from KDE we can ping?