Because Davis was in charge for the most part. I think the EU just plain decided they were not going to deal with him. How many times, following a meeting, did Davis say that progress was being made only for Barnier to come out and say the complete opposite. Citizens Rights and the settlement money were easy. The main problem was NI. May and the civil servants got seriously involved after Chequers. Davis saw the writing on the wall and bailed. As did Johnson. Since then things have moved faster.
That would be Davis who was appointed by May and under her leadership the whole time, correct?