The idea is a bit hard for me to comprehend because there are definitely occasions that I would tap my brake kind of hard and then immediately speed up again. Perhaps my mental model is still very much ICE engine and torque converter oriented and that's holding me back from understanding this. From an abstract point of view, it seems there is only one variable I'm controlling for, which is acceleration, so having two pedals is just doing the same thing with more steps (literally). One pedal should give me everything I need.
I'm not sure about the Bolt, but most EVs work that way, one-pedal or not. Even a hybrid Prius doesn't seem to use the friction brakes unless it has to (emergency, coming to a low speed stop).
I don't like one-pedal on the Hyundai Ioniq if for no other reason than it uses both front/rear motors regardless. In contrast to Eco/Normal mode that uses the front motor only if it feels the need for moar power!!