It doesn't matter if a video disappears in 24 hours. What matters is the experience someone had. That doesn't go away. People will remember the experience you gave them. They will remember the journey.
The idea of using Instagram Stories is a lot easier than it is to act upon the urge to create anything. I often build up an entire sequence of events in my head but when it comes to the process of capturing, I fail miserably because I doubt as to whether any of it is worthy of being shared.
Will anyone care? Will anyone derive value from it? All valid questions but very often we forget how things that may seem inconsequential for us have the potential to be of value for other people. Like Sean McCabe says, what you share matters, but equally impactful is how you made someone feel with what you took the time to create. Friendly reminder for myself in how I should just take more initial using Instagram Stories as oppose to viewing it as a feature that's optional.