Can you tell us what happens on the "sandbox all the things" goal?
I think this is a pretty crucial step forward, even though #sandbox technologies (most often through user namespaces) are more problematic than I initially thought.
As far as I understood, sandboxing needs to happen in #userspace, with tools like #fuse doing the work while being restricted by #MAC like #SELinux or Apparmor.
That is the proposal page. Of all proposals, and there are always quite few, the community votes and selects three to work on for two years. This one was not selected.