It's true at some points in the parameter space, not at others. If you never brake at all, starting to brake more aggressively would be great! Once you've tune

It's true at some points in the parameter space, not at others. If you never brake at all, starting to brake more aggressively would be great! Once you've tuned your parameters to be driving pretty safely and minimizing accidents, which is what Waymo is surely doing for some definition of "minimizing accidents", it must be true that every further parameter change involves a tradeoff like this.