> Grievances should relate to a ticket on the board, if not then make a ticket for it, if not that then is the grievance important?

That mindset is precisely the reason why these meetings are important, because these grievances might not necessarily reflect or deserve a ticket. They might be nothing or they might be something. What's important is that these meetings create a space where they can safely be addressed without creating any burden on the team and on the individual reporting them.

I've read somewhere that these meetings work as therapy for the team. Perhaps by putting it this way you might better understand the issues these meetings solve.