Purpose of tags?

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The webOS client can view and filter by tags as well. I would assume that some of the other clients would look for parity if this were a sought after feature. Tags are extremely useful in some cases, I use them in a number of ways for management and notification for my users as well as have started looking at automation, genre, thematic, trigger warning, and other tagging that could be used client-side.

It all depends on what clients your users utilize.