I'm sure Atlassian knows this as well. When you setup a basic Kanban board in Jira, it is basically a Trello board. It is offered as one of the default options.

I was actually surprised they offered such simple options. Of course the complexity is there, the moment you start wanting an extra column, you're in the rabbit hole.

Probably true, but Trello just had a major multi-day outage that prevented commenting on or moving cards, so I would be hard pressed to recommended it to anyone at this point.

This is true because Trello uses simplicity as a constraint, so users can't make quite as big a mess. They can still make a mess though and as a source of truth it still requires people to move things properly, so it isn't really any better. All project tracking applications suffer from the same ultimate root cause of problems: users.