@pfefferle But you're missing MY point.
I want to avoid using the tags "tolkien" and "mdidleearth" if I can - because they're redundant on that Website.
It's like me tagging every fediverse comment with #michaelmartinez - there's no benefit to it.
The blog's name is not a tag. And repeating the name as tags doesn't serve any useful purpose for blog visitors. It would just be a trick to get the fediverse to see that the blog is associated with those queries.
I can redirect the tag archives to the main archive, sure, but I might one day want to use those tags to collect articles specifically about [J.R.R.] Tolkien (or anyone in the Tolkien family) and the concept of Middle-earth.
If I do as you suggest, I'll have to create distinct tags (like tolkien1 or tolkienfamily or something).