When people look ahead to the day that they will be gone, people tend to feel like looking back on their life and organizing them as one work.
However, it is very difficult to publish something as a book such as "autobiography" or "memoir" and there are lots of restrictions.
Writing and composition skills are very important in order to make it "readable", and once published, even if there is something which should be added, it is already published and cannot be edited.
Many autobiographies look bragging or hypocritical whether the author intended or not, and for this reason, many people may have some sense like "writing and publishing an autobiography is embarrassing".
Also there might be a lot of autobiographies in which the author gave up writing important details to live their rest of life peacefully.
LastCapsule is more easy and light-hearted than the traditional autobiography and memoirs.
Skills such as writing and composition cannot be acquired overnight, but "time capsule" format does not require such skills. Proof of your life, cherished memory, something you think important, put anything that comes in your mind. That's enough.
Text, audio, video, blog/social media archives... you can include anything digital. There is nothing wrong even if the capsule is messed up or filled with something "unnecessary". You can put in or write down something you have forgotten whenever you think of it.
You don't have to worry about whether your life looks worthy from another person's eyes. If you have something to brag about, feel free to do so. You can safely leave the facts, your values, your feelings, anything that is important in your life but you would like to keep in your heart during your lifetime. And the existence of your LastCapsule is kept secret until its open date. You won't feel any unnecessary shame.
Personal records with honest and non-anonymous perspectives are extremely valuable for human history. Future humans might enjoy your LastCapsule as a content, use it as a research subject, or make effective use of it in some way.