Discussion, planning, and design of transit systems that aims to get people to use them must be based on what people actually do rather than on what they should do. The more in line with people’s actual use a transit system is, the more useful and economically efficient it is.
It is irrelevant how far people should want to walk to get to transit. The reality is that they are not willing to walk far, though the more complete reality is that they are willing to walk further to get to a train than to a bus.
It is irrelevant that people could plan around infrequent service. Very few are willing to do so.
It is irrelevant that people should take the bus to get to where they need to go. Either they will or they won’t, and empirical evidence all over the world says that they will do everything in their power to avoid buses.
This is why I have been talking about perception and simplicity. Because at the core of a transit system are people who have to navigate it using their faculties of perception and memory (and more), and who also do not derive equal pain or pleasure from the various modes of transportation. Paternalistic transit planning based on what people should do is self-defeating.