I have a strong use-case for this style: large hierarchies, with possibly conflicting names.
In my day-job at GigantiCorp, I’m responsible for an in-house business rules system. This is actually the system I’ve been documenting with TW and which has lead me to create several plug-ins shared here, but I’m also in the process of using TW to dynamically generate user documentation for the rules projects various teams have created.
A project can have many Categories, as well as some small metadata. A Category can have many Rules as well as some significant metadata… A Rule can have multiple Versions as well as some significant metadata. A Version has some metadata and an executable JavaScript code block.
Projects can be large, owned by multiple teams. Most Categories are shared by teams of 5 - 15 developers/business folks. Some categories have one or two rules, some have thousands. There are no overall naming conventions, so CategoryA and CategoryB could each have Rule1, and typically versions are simply named v1, v2, …
When a project is built into an executable bundle, I create a wiki from all the data for easier viewing of what’s actually in production. I create data tiddlers for all those levels from the various files generated. But I can’t create just Rule1, since there may be rules of different categories with the same name. So I have tiddlers with titles such as CategoryA, CategoryB/meta, CategoryB/Rule42, CategoryA/Rule7/v3. Each tiddler also has one or more tags, always at least one of Category, Rule, Version, Meta, etc – these are used in view templates and elsewhere.
While I could duplicate this hierarchy using field names or tags, I already have it in the name structure, so it’s what I use to list children in each template. While this is still in the conceptual stage (I’ve created a small sample output wiki, but am not yet generating them live), I did the same thing (with far fewer TW skills) on the predecessor project, and it works quite well.
I’m sure there are other reasonable use-cases as well, especially for dynamically-generated wikis.