As a none Niro owner lurker / likely future Niro owner I have some observations on the safety nannies as experienced in a 2015 Subaru with Eyesight and a 2017 VW Golf with cross traffic warning and forward Collision Braking.
1. Subaru's lane departure only beeps (doesn't self correct) if I'm drifting off course, helpful, occasionally annoying.
2. Subie's CC that maintains preselected distance between vehicles is truly a pleasure when on freeway, makes driving much more relaxing
3. Both cars have autonomous braking and cross traffic alert and both those features helped alert me to traffic slowing when I'm spending too much time fussing with music or climate control or "sightseeing" (I know, I should be paying more attention to the road) or someone is approaching from side as I back up.
Personally, I could probably do OK without these, but believe they are safety features that will save sheetmetal and possibly a life in the future. Honestly I think they are worth every penny and wouldn't buy a car without these features.