[OSM-talk] is_in and similar tags

[John Smith]

Is there a real need for is_in tags or have admin boundaries replaced the need?

It seems there is a lot of redundancy going on for example node id =  17652780

aeroway = aerodrome
closest_town = Newcastle, New South Wales
ele = 9
iata = NTL
icao = YWLM
is_in = Australia, NSW, New South Wales
name = Newcastle Airport
name_1 = RAAF Base Williamtown
name:en = Newcastle Airport
operator = Royal Australian Air Force
place = airport
source = wikipedia
type = Military
wikipedia:en = RAAF_Base_Williamtown