I haven't checked, but don't think I've missed a single day in almost a decade. It's basically the first thing I do when I sit down at the computer in the morning. I'm sure there are a handful of exceptions where I was on a 18h flight or something :D

My thought is: if I have to force myself or keep forgetting it, the system isn't working. So if I was constantly forgetting to log, I'd find some way to make the system more accessible/remind me. But I don't have that problem.

At one point I was tracking 6+ daily things, most of them completely unimportant, and I realized this was making me be less diligent, largely because it felt like most of the values didn't matter at all. So I stopped tracking factors I don't consider important and consider them "mental clutter."

Impressive! And super interesting, thank you for sharing!