In the future there will be tons of people, governments, and other organizations trying to destroy what Evan has built... there really is no reason to "groove" a pitch right in the middle of the plate for them.
Reading between the lines of all the trolling and fud attacks, there's a lot of jealous developers out there who know crypto a lot better than any external agencies that will one day be threatened by Dark.
That IMO is going to be Dark's true enemy in the coming weeks and months.
I'm sure Evan and his talented team know this, for those reasons alone he can't make everything open source until it's bullet proof.