There are about a hundred things that you can say that about. There are several posts where people are saying “it’s absurd that Dorico still can’t do this”.
I’m sure that this is “on the list” of things to be added to Dorico; but the list is long, and the team is small. And if the person who knows about video/playback is working on something else, then they can’t do this as well.
No, but it has to fight for its place in the queue, based on limited resources.