A while back, I started tracking some basic notes about my behavior and wellbeing. Mostly I just covered very basic notes on how I'd slept, what/when I'd eaten,

A while back, I started tracking some basic notes about my behavior and wellbeing. Mostly I just covered very basic notes on how I'd slept, what/when I'd eaten, what else I'd consumed (i.e. caffeine, theanine, vitamin D, alcohol), and whether/how I'd exercised - plus how I felt at the time. The results were really interesting, and having that subjective value matched with objective context was great for predicting "how will I feel if I do X, Y, and Z today?" I'm sure I was still losing important data by not seeing multi-day effects, gut biome status, or a million other things. But the predictive power was fairly high, and I'm convinced it was better than nothing. I stopped eventually though - because as you say, the tools available are just too clunky for tracking anything other than diet and exercise.