I mean, the introduction of the date of birth field is obviously done to make it easy for distros to comply with age verification by simply saving the birth date and nothing else.

As for the other fields: what use would it have to have such info at OS level? What application would use these fields and how? I mean, some fields, like the 'location' one, already are pretty useless, as, for example, the 'location' field doesn't seem to bhave any firm consensus on how it should be formatted. Even the documentation lists both "Berlin, Germany" as well as "Basement, Room 3a" as valid values.

So I doubt not introducing such fields has any sort of political agenda to it, but just raises the question on why such fields would be useful to begin with.

you mean like adding it to a bunch of optional details already?