I asked the same thing on Discord about nested tags and how to use them. Many advantages. Just adding my original text here after @sam.baron pointed my to the feature request …
Question: would it be possible to change the tag system so you can have nested tags? Something like #work.projectA.sprint7 would show up in the tag screen as a tag work which folds open to a projectA which in turn folds open (like the file explorer) to a sprint7 tag which folds open to show all files having that tag.
And in my view I would even prefer to have this as the alternative for the fil e explorer. Advantage would be that a note can be shown under different tag-trees (if that is a correct word). A bit like very early Evernote (version 2.2) did it (if anybody is around to remember those days).
This has come up now I have altered my vault from a vault with many directories to a vault with no directories (or 3 to be precise (attachments, weekly notes (instead of daily) and projects. The main reason I did not like working with directories as it is very unknown where you are in the tree.
I think this would work greatly with added flexibility and the ability to shown notes in multiple places in a tree. And because of the drilldown on tags it is easiers to remember. Offcourse auto-completion would be needed. Like to hear what you think about this …