They add a tiny bit to the efficiency and/or range, they look cool (e.g. serve a gee-whiz marketing purpose), and safety evaluations in the markets where they still exist don't penalize them -- up until now they've had very little against them.

Maybe as legal and reputational backlash spreads the pros will not outweigh the cons. But someone designing a car a decade ago, marketed towards early adopter types, would have had no reason not to.

And I say this as someone who hates these handles designs personally.