Am I the only one seeing the change between l4 and l5 abysmal? Also L5 description, at least in the Wikipedia article, is much more vague than the rest
However, in terms of technology, level 5 is a big step up.
Consider for instance that a level 4 system can assume that the ground is purely flat (an assumption that Tesla’s FSD vector space makes), while a level 5 system needs 3D information to navigate some vertically-diverse terrain.