The billing page displays all invoices, it seems logical that a payment status column should be added so that the page displays the invoice number, date, amount and status. It would help admin users ensure there are not lingering overdue invoices and make that page a more complete overview of invoice history.
Thank you for the idea. Given the low volume of support for this idea, we do not have plans to make updates in this area at this time. We hope you can understand.