Sad that the other two platforms won't have the same stewardship as Orion on macOS. Especially since we're likely to see drift from the core WebKit implementation between them now.
I don't understand the decision to open source the Linux and Windows ports, but not the MacOS version. They should have moved their Orion development into the open, and said we're not going to support Linux and Windows going forward. Then someone else could have picked up the task of keeping the Linux and Windows forks in sync with their MacOS work.