Private journaling is likely to end up encrypted forever and not accessible to the families of deceased persons. Sure, it could be argued that it was encrypted on purpose but one never knows. Someone may suddenly pass and their loved ones would never get access to this piece of their work even if the author intended to share it and never got to leave the encryption key (they never expected their sudden departure)
Sure, this same thing could be argued about electronic mail, computers and other encrypted devices but I feel something deeper would be lost a lot more often.
Imagine Kafka used an encryption tool on his work or countless of other silent authors whose work only came to life after their death when somebody else discovered it.
That's a problem with encrypted stuff in general, and as a society we really haven't worked out any better way to manage that yet than measures like "keep a clearly-labeled master password in a safe deposit box where your estate can get at it".
Sure, this same thing could be argued about electronic mail, computers and other encrypted devices but I feel something deeper would be lost a lot more often.
Imagine Kafka used an encryption tool on his work or countless of other silent authors whose work only came to life after their death when somebody else discovered it.