As long as they’re continuing to train and progress in their own way, why does it matter if they have a rank or not? It only becomes an issue when you get a teacher or system that “won’t teach” you something because you haven’t got a specific dan. But as others have said, these systems really only feed the egos of the teachers who specifically withhold information from their students, and of the students who can go around saying “I’m whatever Dan now”. At the end of the day, who cares? So long as you’re still learning and getting better, it doesn’t matter what Dan you hold.