Unfortunately, tbis may be the simplest and most cost effective way to clear the backlog. It's unfortunately for people who in good faith made honest mistakes or were victims of honest mistakes. But it also may be a low cost way to filter out bad faith applicants who were never planning to pay pensions/taxes fully. An assymeytry of information means we never see the balance of honest mistake vs dodgy excuse makers.... Alos, Japan tends to play the grey zone of rule interpretation as a buffer zone for signalling hard feedback. it is generally periodic and ends after a while.