Greater Tokyo area resident here. Agreed, and I think exit count is the mechanism. The standard is one accessible route from street to platform, so a station wi

Greater Tokyo area resident here. Agreed, and I think exit count is the mechanism. The standard is one accessible route from street to platform, so a station with twelve exits satisfies it with one, and your Yamanote case is what that compliance looks like from the ground. On weekends with a stroller I can always get out, just often not where I needed to be, and once you are outside the gates that gap is a lot more than five minutes.