The problem with the mandatory SIDS (and other blanket rulings from the regulator) is that a few of the old Cessna's were rebuilt, maybe 5-10 years ago, due to the regular inspections finding problems or simply as a restoration project. Now these owners or subsequent owners are told they have to have a full inspection despite knowing that the whole aircraft was stripped and rebuilt not that long ago. Yes it will pass the inspection with flying colours but it is another cost imposed upon a conscientious person who looks after their aircraft.