With recognition of the varying road conditions across the globe, lane assist may be the most laughable requirement of the lot with the least return on the dollar and an arguable safety enhancement. Why, eg roads in Cornwall, the Scottish Isles, or the tracks (improved or not) in the bush as flippant examples. But since they might help inattention on modern dual carriageways, US Interstate highways, the Autobahn, the M1 and friends, and similarly improved roads, lets mandate them?
I do not know anyone with lane sensors that has not turned them off and left them off. I obviously do not know everyone.
Even autonomous cruise (I love it) can become an accident waiting to happen if the driver is not actively ‘driving’. Personal experience: a bend to the right on the 4 lane road limit 80kph with a turn lane going to the left and a vehicle enters the turn lane and slows; the cruise sensors mistakenly thought that vehicle was straight ahead and closing very fast so hard braked. I disengaged it quickly so only a second of angst, but another second and there could have been a multi-car pile up. Someday they will add steering geometry to the ‘closing on an object’ algorithm, but apparently not universally yet, save for the ‘highly dependable and safe’ autopilot/autonomous implementations where the driver becomes a passenger. (yes, a bit of sarcasm, misplaced or otherwise).
Every safety feature might be more or less additive, but at what cost and result?