I think that you are totally right. I received from my ISP a list with all compatible devices, with adsl there are more Dlink products, modems,routers and combi.For VDSL ( the use V2 last version ) Dilink is not included.
Maybe they are testing Dlink devices I do not know. I think that there is also a problem that Dlink has no modems or bridges for VDSL as other Manufactors and if we are obliged to connect a router to a 3part modem or bridge, some problems of compatibility may be emerge.I hope that the situation will go on normalization and the ISP will open to more devices. It is only to think that the compatible devices are not in the common stores, and that reports as a commercial action....
Best regards and I will hold you on the facts.