Kanban came from elsewhere. The word comes from post-war Japanese car factories, but the principle is older. Kanban boards were physical boards, with tokens representing various machines' or workers' availability, and the presence of things to work on. It's more a work-scheduling mechanism for known, understandable, repeatable work.
Interesting to know - thanks for the info. Strange to think that something designed for 'known, understandable, repeatable work' got adopted by software development.
Some software-related work, like regular changes to a website, or regular SRE work, is understandable and relatively repeatable.
Software development work usually isn't. Software development, by its nature, automates away everything repeatable and predictable, so unpredictable and never-before-seen stuff dominates.
https://en.wikipedia.org/wiki/Kanban