Most safety features are nothing like lane assist. Lane assist is not a representative example of what most safety features in a care look like. Most safety features are crumple hoods and pillars, safety glass, airbags and seatbelts.

Additionally, you think it is a more feasible solution to change culture than to make the safe operation of a car less reliable on the human element? How exactly do you "make people better and more attentive?" Training? Please elaborate on what that would look like.

Cars are designed a lot more thoughtfully than they used to be. An example not related to safety is cupholders. Remember when two flat rings on the dash were considered acceptable for holding a cup? Safety wise I'd say designing contingencies against inattentive drivers is thoughtful design.