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There were some discussions, how to work around between adding tags manually, or using computer where possible, how not to mix this too much.

I came to idea: why not to separate user defined, automatically added and system tags?

Lets make:

Tags - Tags that are defined by user, added manually, like "winter", "Fun"
Flags - A system tags, like "inbox" or "trash". They are also important, and could be used as tags. But since they are threated differently by software we need to put the separate.
Labels - labels are automatically added tags like exif data, folder structure etc. labels differs from tags, that they also has source information, like exif-camera: EOS35 or filesystem-size:big or filesystem-folder: summer


This would keep them separate, but at the same time user could feel power of all of them. Best example in auto-completion features in search boxes or ir finding related items.

Its more technical question if all this data should be kept in separate tables or mreged to one, or use pre-cached index. (i.e. you have a tag "summer" and a folder label "summer", Its logical they men the same for user, but are they the same for system?

Last question, how to filter, that data should be used as labels. This could be a OS wide default component, so users would have to set up just once, what data to include and what not. Similar what we have for managing shortcuts.