You won’t believe how puzzled I am every time I gently try to get attention to this on Discord (which I do from time to time - I’m gala8y on Discord). It’s like standing on the edge of the blackest void. No response (with two exceptions). At this stage I start to feel like I’m doing something wrong, or missing something. xd
Nicely put.
Without this, tags become useless pretty fast. With this, all is possible.
And I’ve noticed that this idea is actually rarely implemented, AFAIK.
Del.icio.us, ZimWiki, Evernote, Bibsonomy, Pinboard. (Edit: + apparently Roam and Notion as Dpthomas87 mentioned before.) Not too many examples I know of.
Also, I would be happy to help in any way possible I can to help incorporate the idea, eg. thinking/discussing about implementation, including donating to The Cause. 