Drivers of manual petrol cars can already reduce their brake dust by using engine braking. If one drives very carefully it is possible to not use brakes at all. Indeed it should never be necessary. Any time you hit the brakes means you were going too fast. But how many people drive like this? Barely any. Instead people speed right until the last minute then slam on the brakes. Then as soon as the opportunity arises it's heavy acceleration until the next slam of brakes. Driving EVs like this will produce just as much brake dust.

Eventually I had to brake on purpose a few times to keep my brake discs shiny, because the rusty discs looked awful

I've been driving hybrids for the past five years and in my experience even in heavy traffic friction brakes aren't used nearly as much as in regular ICEs.

There's a constant, thin layer of rust on my rotors that I just can't scratch off in any way short of braking on an off-ramp on a highway.

I imagine EVs, having overall better regenerative braking, rely even less on their rotors.

I've always owned at least one manual transmission vehicle, but the EV does an order of magnitude more regenerative braking than any passenger car internal combustion engine does.

Out in the country, and for me that often means the hills and mountains, then engine breaking is a much bigger part of my driving style, esp down hills!

Engine breaking also doesn't cause your break lights to come on, and they provide a quicker signal that a car is slowing, than relying on people to detect the change in speed.