They didn't until they realised they should, so they did. Time and attitudes move on but you can't change what has passed. Oh and computers were invented.I see the issue in slightly differently. Back in the day I did my DS as a spotty 18 year old, an orange log book if my memory serves me correctly. The sea school issued the certificate, BUT the information was never centrally recorded. My question would be why did the RYA not record the information of who had issued one of their certificates to whom?
While doing some family history research I dropped an email to a certain Scottish organisation, where men have funny handshakes and it is said roll their trouser leg up (I'm not a member), requesting information about my grandfather and was amazed at the detail I received back about him and my late father.