If you routinely charge in a very narrow range (say 60-90%) then the _estimated_ capacity of the battery becomes inaccurate over time and doesn't necessarily indicate actual degradation.
When I first got my car, I followed Tesla's advice and left it plugged in all the time it was at home, which with my usage meant it was almost always sitting between 65 and 80%.
I perceived premature degradation, opened a service ticket and had a long chat with their second level support team about how my charging pattern was perfectly fine but didn't give the BMS enough data to accurately guess the actual capacity of the battery.
I changed my habits and over the course of a couple of months (I am a low mileage driver), the reported degradation went from 11.6 to 7.5%, much more in line with fleet averages.
There are some comprehensive write-ups around here about why this happens ("BMS reset" amongst other keywords), but if you charge in a narrow band it's pretty well understood behavior.