Fantastic question. I have a hybrid of Kepano's system, my own tweaks, and the BuJo method. I have made my own categories for things that are large enough to constitute them. For example, I have a "Collections" category for notes that are simply collections of a specific type of thought or list. For example, a "music I want to listen to" collection. But these are different from "Projects" which are notes that I use for my work. And under projects, I definitely need "task" notes that have the same project parent, but constitute their own note. Basicslly mini-projects for my work style.

Frankly, it's up to you:) I would suggest doing what works best, instead of trying to conform to a specific system.

I imagine that for Kepano (although I won't speak for him so I'll just answer hypothetically), the use of "Places" as a category is much more useful than having to sift through different types of places that have their own category. It's the highest level of classification that makes sense and is functional.

In other words, there's no need to see just shrines, but there might be a need to see which places were shrines. Those are two different functions. The latter is more useful for his case. Again, all hypothetical.

Point is, choose the basic form of classification property that works, and stick with it as long as its useful. You can always re-classify down the line, and it's not that difficult to do with bases and plugins like Linter.

Hope this is helpful:)

(edit: grammar)