Board Thread:Help!/@comment-7657843-20170301223451/@comment-188432-20170530182554

Well, the reason for the disappearance of the multi-colored "New Paradigm" Daleks that debuted in Victory of the Daleks is almost certainly to do with behind-the-scenes reasons, just as much as their introduction was. I don't know that we have a full explanation yet, but it's heavily implied in CON: War Games that the NPD were very much more difficult for the Dalek operators because of their increased volume and mass.

Narratively, the history of the Daleks is as much a problem in the BBC Wales era as it was in the BBC London era. But Steven Moffat has certainly gone out of his way to confuse things. Both Asylum and the Series 9 opening two-parter showed Daleks that hailed from as far back as the 1960s, so this notion that the NPD replaced all other Daleks is obviously false. Seriously, the last scene of The Magician's Apprentice will have you scratchin' your head as much as Asylum's "Parliament of the Daleks" will.

While you might be able to convince yourself that the NDP created a variety of new casings based on earlier designs -- and that they are, as XX-Connor-XX said all NPDs -- there's really no narrative that directly informs that determination. And there's absolutely no story of which I'm aware that gives an explanation as to why the multi-colored NPDs have been absent for the whole of the Capaldi era.