This is a false dichotomy. You seem to think that the way speeds are enforced, with a focus on revenue generation, means that speed limiting is only for revenue generation. That is just not true. At higher speeds your reaction time, combined with stopping distance increases, mean that you need more warning and space to avoid hazards. Cars pulling out of driveways/side streets/parking lots, cars changing lanes, cars stopping to turn, pedestrians crossing roads, bicycles, etc. all take time and space to respond to. That is why we don’t have home driveways or crosswalks on a freeway. We have 15-25 mph school zones because children can and do behave unpredictably and may dart out into traffic, so a drive will have almost no time or space to respond.