Our use case is that we need to be able to prioritize (via drag and drop) all of the topics that have a certain tag so that specific people on our team know the order in which to address each topic. I think the Kanban Theme allows moving topics between tags but not vertical prioritization/order, so it won’t work for us.
However, I ended up building a little app (called “Discourse Buddy”) which ties to our Discourse API and has a UI for dragging and dropping the topics as well as marking them as “complete” (which removes the tag). The app can embedded right into a Discourse page so it is working perfectly for us. If there is any interest I’ll package it up and post to github.