I think there would be room to improve on the first two and last two. In part, it’s also that there is probably now going to be some standards in measuring and defining those (more customer friendly way to compare etc.) - but I have no idea if those are still worked on and negotiated somewhere (including that criticality definition).
Well… maybe not 
But the main reason that L5 is not required to adhere to those is that it has already been introduced before that June date (devices can’t be required afterwards).