This sounds a bit obvious to me after I write it down: I think there’s some value in the fact you were unaware and it was a random time.

If you take your work very seriously, I can see it being valuable to record it like athletes do. It would be tempting to use this on the “most important” days or when you’re “really ready”. At the very least, there’s a burden of choice and memory. I don’t know about security implications, but it seems valuable to randomly record a day per month and send it to yourself a week later. Or in the case of this tool, select some period for extra review.