No, its the natural cycle. What passes away fades away. Anything that is kept up needs to be kept up actively by the generations. That which is valued needs to be preserved, such as wisdom, knowledge, art, science etc. All your drama and idle musings, maybe not. Unless you're deemed worthy by the next ones. I understand that this is a scary thought but our impact is only kept if we act such that the next generations want to preserve it. 5 generations down even your genetic impact is people who share 3% genes with you and 97% other people. Imagine a classroom with 32 people. For each of your descendants 5 generations down (which can be zero or many, the count varying greatly based on choices made by not-you), you're one person out of that classroomful of ancestors.

Sure it's kinda cool to see some fragments here and there. But would I want it to be the standard that we keep all the emails, chat messages, phone camera roll, GPS logs etc of people... Hell no. I'm not advocating for absolutely forgetting everything. But we have to filter.

Deeply agree. I think it is the other way round and it is selfish to expect those that come after you to carry that burden. The OP says it is "something that weighed her down for the last 15 years of her life", and that she felt the duty to scan the diaries even after the diagnosis of cancer. Wow, now that sacrifice is a beautiful precious gift, and anyone expecting such gift is utterly selfish imho.