I agree that those are all ways of preserving knowledge in a somewhat inter-generational way, a few thoughts.

- None of these are as flexible as writing. They're more expressive, more engaging (arguably, at least to some), and might even be good at succinctly saving certain specific types of knowledge.

  Knot systems typically parallel the abacus, having been used for accounting and to keep a record of tax levies. Certainly this isn't the *only* thing they were used for, but this was the case in a number of indigenous civilizations in the Americas, as well as in some Asian civilizations. Certain dances might be good at representing the motions you have to go to while working fields or performing other societal tasks, sure. But a good writing system, in its relative blandness, is incredibly versatile, and can encode not just a wide breadth of information, but also include information about *why* the information is what it is, to the extent that the authors knew.

- Many of these systems tend to either disappear or change over time while relying on largely-unwritten rules, implied social context, and other informational artifacts that themselves don't have a very long shelf life in the event of significant social change. Where destroying the written word (especially in the wake of the invention of the printing press) is a long-term, conscious, coordinated action; dances, songs, and stories can fall victim to everything from fashion, to counterculture, to human migrations, to hostile invasions.

- I don't understand what you mean by things like "stories with self-correction." In many cultures with an oral tradition, the stories do get distorted because of people misremembering, or through conscious changes in response to social conditions at the time of a retelling; if a 1,000-year-old story with no written record backing it is told today, it's almost certainly not the original story, but the culmination of a thousand years and dozens of generations of sometimes-subtle, sometimes not reinterpretation.