One advantage of their system over a static map is that it varies with zoom level, as lines that are near but not touching when zoomed in would end up on top of

One advantage of their system over a static map is that it varies with zoom level, as lines that are near but not touching when zoomed in would end up on top of each other when zoomed out. The map can display several types of transit simultaneously, like subways and commuter rail, which can be toggled on or off. So you'd end up needing to hardcode many different versions with different settings and zoom levels to get similar results.