I said the sponsor and I would follow up here, so here we go:
Out of your list, this solves:
- This is solved
- Indeed it improves on this even further, by offering the zero tag case too (as well as the single tag)
- You don’t need to go to
/tags/tag1
at all so long as you don’t need a Category combination. - You can make the interface the homepage on desktop and essentially replace most tag navigation.
In addition I add basic support for different filters, eg:
Latest, New, Unread etc.