If they designed a directory tree without knowing what a directory tree is, it sounds like they know what a directory tree is, they just don’t know the word, and you can’t explain the word properly.
They didn’t “design a directory tree” either. They were designing screens for a thing that sits on top of a directory tree, and they didn’t understand the underlying concept.
It was likely because they’re used to the abstraction that iPhones and iPads provide, where the underlying directory structures are largely hidden from users.
If they designed a directory tree without knowing what a directory tree is, it sounds like they know what a directory tree is, they just don’t know the word, and you can’t explain the word properly.
They didn’t “design a directory tree” either. They were designing screens for a thing that sits on top of a directory tree, and they didn’t understand the underlying concept.
It was likely because they’re used to the abstraction that iPhones and iPads provide, where the underlying directory structures are largely hidden from users.