(This isn't a "maintenance & repair" question, I hope you'll forgive me.)
When powerful electric cars (such as, but not only, the Tesla) can accelerate from zero to ludicrous in half a jiffy, and can do regenerative braking, then why do they still use "old school" mechanical disc brakes?
Does acceleration ability not equate deceleration ability? Is the brake construction mandated by law (I know, this depends on location, but seems to be the case for all brands anyhow)? Or is it a safety feature (no power=no braking, oops)?