Sorry, im not sure what "Tag Notebooks" are 
i did some searching overnight but couldn't find anything; hoping i've missed some function!
If you remember the old days of iTunes, you had in the left panel a list of playlists, and in the layout/hierarchy iTunes didn't make a distinction between static playlists (those where you dragged and dropped a song into) and smart playlists (those that were dynamically updated based on some set of criteria) - they were distinguished by a different icon. Thus you saw ALL of your playlists listed. Now imagine that approach in Joplin - in the left panel you would see all your notebooks, some of them could be static - you add notes to them manually; others could be dynamic/smart where they update based on your criteria (for example a combination of tags), and yes saving a search as a notebook could accomplish this as well.
For my own use case, I would save all my notes into root folder, and I would apply tags. I like to have an overview of the work I did for a day - so I could have a folder structure YYYY/MM/DD - and dynamically collect the notes that were created or modified on that day - its quick to build a journal (right now I have to choose between project chronology and ease-of reading). I could save the same set of meeting notes into the multiple projects that meeting covered. A single piece of research that applies to multiple projects can be saved into each of them quickly and easily.
with all that said - and I realise that I am just rambling about more features I'd love to see - but it would be really cool (for me) to see a folder of notes as one long note, rather than individual notes. This would allow Joplin in the background to store each note individually (which is helpful for reuse, etc), but when working you can just keep scrolling back through the project, rather than swapping notes all the time.
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