D stickers gone???

Huhu… Would there be a question! On my omi there is an open tailgate of this white oval sticker with the thick D on it which we certainly all know…so…is this now still absolutely necessary???? I mean since there are the euro plates (which my omi meanwhile also has) is still the country of origin on the mark… Or does it have something to do with it, if the car should be sold abroad that the origin (i.e. the original mark) t for which the vehicle was manufactured) the car remains recognizable because of the differences of the vehicle in different countries???? I don’t like the sticker at all and I would like to take it off, only my dad thinks he MUST stay there otherwise the TÜV complains… no plan why… MFG Alex