Config Inconsistency - Zone and Person

I just upgraded to 105 and took the opportunity to define my Zones and Persons through the UI.

Can someone explain why I need person: in my conguration.yaml but I don’t need zone:?
(I don’t have default_config.)

Considering how simple this is it took me longer than it should have because1 I don’t think the docs especially for Zone are that clear or even consistent2. It doesn’t even mention the UI way to create them.

Or of course explain why I am wrong?

1Also there is no migration path for existing YAML defined zones so a lot of copy paste was needed, but that is not the point of this post.
2 And before someone says anything, no I can’t suggest a change to the docs because I don’t know what those changes, if any, should be.