A trickier question than it might at first seem. So. Many of our games have dependencies (code and functionality wise) on the Steam distribution channel which means that in order to serve them through the launcher, they'd have to be touched up quite a lot in addition to having two concurrent versions that need to be maintained. This creates a burden for the game teams that they are not, in all instances, prepared to assume.
Naturally, down the line we hope to get our entire backlog available on our own distribution platform, but it's a bit of an involved process and it'll take some time. The distribution team
is hard at work with some pieces of enabling tech, so we remain optimistic that you'll see it in a normal lifespan!