Hi,
To be honest – we should implement it in this case also for authors. It will generate 2 additional files (XML and JSON feed) for every tag/author, which also will be updated quite often (with every change of tag/author page content).
Maybe in the future as a plugin. But it will require more users interesed in such feature. In fact I think that RSS is slowly dying and less and less people are using it :/
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