So they want 100% compatibility first and then implement features that require massive and incompatible changes?
So even if they reach 100% compatibility they never get equality.
Then Vibe into that and add changes that breaks the existing coverage...
Why not reimplement the entire thing from the ground up with the changes in mind from the start instead?
The upgrade is an afterthought to a system that is not verified to be fully working and the new features will break the existing verification too.
If I had OCD it would be triggered to the max by this. But I'm just sipping a drink from the sidelines.