A golf is a golf is a golf.
Hmm... not convinced. If we were part of a golf owner's forum then yes a golf is a golf is a golf but if I remember correctly then this site is called golfGTI.co.uk which I consider to be specific to GTI models.
There are other forums for specific models such as mk6 owners forums and R owners forums. With the exception of P3eps there are no R owners on this forum that I can think of because they have their own forum.
The reason the GTD is acceptable is because it is a GTI variant. The R is a separate model as are standard 1.4 Golf's. All are equally valuable models in the range but to say that they are all the same is a bit too general I think.
I personally have no problem if there was a GTI section and a GTD section within mk6. I do however feel that it should be called the GTD section and not just Tdi as Tdi in no way refers to the pedigree of the GTD.
If a golf was just a golf then why do we all have GTI branded sterring wheels, GTI specific alloys, GTI tartan seats, GTI levels of specification, GTI engines, GTI suspension setups and GTI brakes.
We all bought GTI/D models because we wanted GTI's or GTD's. That's not just because of he 2.0 TSI or TDI Engine, or the 5 seat configuration, or the styling, but also because the car is iconic and our understanding of that icon is class, quality, performance and practicality.
So why then should we deny that icon and call the GTD section the Tdi section.