You can use cheaper script paths till Q-day. makes sense to me to have optionality, but also have a backup plan. It’s early migration without the massive negative consequences.
edit: Want to add that I like this new approach a hell of a lot more than the original 360 proposal. I like the direction this is going! I would personally move forward and beyond the Great Script Restoration direction and make script capable enough to implement PQ schemes in script efficiently enough, but I can see why that would be more controversial.