One of the problems with EV’s is that the brake discs are rusting because they almost never gets used.
Rusting is for me more associated with the weather and lack of use of the whole car than with how much do you use breaks when you use the car.
I could run my errands without braking at all (except when stopping at a parking lot). Anticipate lights and traffic flow, downshift to slow down.. that's how I used to drive. At home I could even park without braking to slow down, thanks to a small incline at my parking spot.
My previous car, which had automatic transmission, didn't have really show any issues with rust because I actually had to brake when driving around town. Same weather, same locale.