Tags could be an awesome feature, but currently it is too hidden to be useful.
To enable workflows based on tags we could:
[] Preserve extended attributes (e.g. tags) when copying files: https://bugs.kde.org/show_bug.cgi?id=116617
[x] Show a list of tags in Dolphin's places panel: D7700
[] Enable manipulating tags from Dolphin's context menu D16872
[] Associate colors with tags: https://bugs.kde.org/show_bug.cgi?id=37300
[] Expose tag support in the save dialog
[] Add tagging support within KDE applications, e.g. from the file menu
[] Fix issues in the tags:// KIO-slave (e.g. T8505)
[] Tags in Information Panel do not update automatically https://bugs.kde.org/show_bug.cgi?id=401019
[] Deleted tags are not removed from Places Panel