Andreas speaks about DAG. I think he is right that with DAG you sacrifice decentralization and coersion resistance by removing proof of work. Byteball is a good example of this. We have 12 witnesses in the hands of 1 person. And even if these 12 witnesses are 12 different people it's easy by governments to coerce them for censorship or just shut down the whole system.

https://www.youtube.com/watch?v=lfgMnbb5JeM