@EUbrainwashing - Overcomplexity, design errors and too many cooks
I don't think that there is any deliberate slowdown in the project, just mistakes, bureaucracy, lawyers, personnel departures and disagreements.
There seem to be several key design errors starting with the level of abstraction that the Youview platform UI will operate at and the requirement for hard disk products. I think that applications may also have far too low level access to the hardware and the system although I haven't studied closely.
Too much effort also seems to have gone into bandwidth use minimisation strategies (trying to support multicast, speculative recording etc. rather than just telling ISPs to get their act together and content providers to just get a CDN to distribute it.
But the main problem in technical development has been to keep the partners happy. In a number of areas telco interests will have opposed the content providers wanting options to strike their own deals on their own networks and offer prioritised traffic. Commercial content providers will have wanted extensive advertising support features and guarantees of placement in the UI. Occasionally the technical partners who are expecting to actually make the boxes will have been let into the room to explain how impractical the requirements and plans from the consortium are. And everybody can disagree about the background colour of home screen. Then the lawyers come in and set some more restrictions.