What the Readiness score hides
Readiness is a single number stitched from a dozen signals — HRV, resting heart rate, temperature, prior sleep, recovery index. It's a fine traffic light. It's a terrible explanation. It will tell you today is a yellow day; it will never tell you that your deep sleep collapses on the nights you train late, that two glasses of wine cost you 18ms of HRV for the following 48 hours, or that your temperature climbs three days before your period and drags Readiness down with it.
The export holds all of that. The score throws it away. Reading the export is how you get the why back.