(well, I was once hit by a car, but I was on a bike so....)
And bike lanes are already segregated with at least paint so that's already a signal. People just need to get used to it, which is hard initially when all you know is cars and walking.
SF for example is full of solid white lines. The law says solid white lines are supposed to be treated the same as concrete barriers. No crossing period. Yet people cross them all the time with impunity. If they were actually curbs people would only rarely cross them accidentally
As a cyclist, it's easy and essential to stay on the right side. Accidentally not noticing the curb will result in a crash or near one.
Research shows sloped or even leveled kerbs don’t seem to lead to problems (https://journals.open.tudelft.nl/ejtir/article/view/3254)