The long cane is used as a probe and bumper, to detect objects before the user encounters them. The ID cane is simply used as a means of identifying a person as having a visual impairment. It sometimes detects depth. The support cane is usually used by seniors to support their weight, warn of changes in depth, and identify them as visually impaired. Some support cane users are younger people with additional problems which affect balance etc.
Most blind people can sign their own names.
The totally blind usually use templates to keep their writing line straight. The legally blind usually need no assistance. Blind people identify coins by touch. Many blind people fold bills of different values in different ways. How do totally blind people identify clothing, food etc.