There's this [bit of code](https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwiki-platform-model/src/main/java/org/xwiki/model/internal/reference/DefaultEntityReferenceValueProvider.java#L39), and as far as I understand it allows for a configurable default page name. As in, if the default is set to ```WebHome```, then ```XWiki.``` resolves to ```XWiki.WebHome```.
If I am correct in the above assumption, then the setting could be (for example) ```Prices``` instead of ```WebHome```. And somebody might not like that, for example ```Cars/Prices``` resolves to ```Cars/```.

Of course that is an unlikely scenario, but is it a concern?