Maybe customers were wary of having 1 ton of steel barreling down the street. And there's no ergonomics in phones. Their prime quality is portability. Ergonomics has been sacrificed to convenience.

Iirc it was said that speeds over 30 km/h will kill you too.

A ton of steel bearing down at those speeds will do so handily.

worldwide over 1 million deaths a year...

How many of those were wearing seatbelts?

very few pedestrians involved in accidents with cars are wearing seatbelts

It's interesting to see the change in discourse given the opposition to seatbelts from this thread: https://news.ycombinator.com/item?id=39977058