Imagine a world in which everybody does everything earlier during the summer, including buses, and we were discussing the convenience of having DST: "but if we

Imagine a world in which everybody does everything earlier during the summer, including buses, and we were discussing the convenience of having DST: "but if we move forward the time, the buses will start running before people go to work and they will be much less frequent when I have to leave!". We need a convenience to which everyone agrees about how to deal with the different sunrise and sunset times. The question is which system is more convenient. But you cannot evaluate one of them under the assumption that everything will work following the other one.