Take your example of the ineffectiveness of the note taking defense in support of a dispute. What would it take to overcome that and still retain control of the recording hosting/mechanism? What features would be necessary so that self-recorded records rise to equal authority with corporate records? Will they ever? What about recorded through a 'notary' service offered by a tech giant that you already resign any sense of privacy with?
A hopeful example of the value of self-recording: Car dashcams are relevant for insurance claims. Or are they?
People used to take notes to prove their boss wrong when he said "I never said that!" because they weren't under surveillance.