This feature is essential. We need private fields.
We need to be able to track budgets, time cost, etc… on a task level basis without guests and task collaborators being able to view this private information.
It’s extremely frustrating that this hasn’t been implemented yet, and is really hurting productivity, and I’m certain countless other users feel the same as there’s several topics that would be solved by this that go back years.
As a workaround, I’ve had to duplicate every task as a subtask within itself in order to do this, and it wastes a ton of time.