The latest build is based on the LibreELEC latest build, this means moving from the Slice skin to the Estuary skin. If I point stable at that build then there would be no way of going back to the Slice skin
I'm assuming there will be people who are happy with their Slice box as is and would prefer not to lose the skin. So I am not planning on ever updating the Stable build.
(Stable is after all meant to be stable and it is...)
For CM3 when it is available in the next couple of months we'll move to a more standard LibreELEC build and stay that way...