The idea of battery degradation is scary because most EV owners may not have a clear baseline of what normal looks like. Losing a few percentage points of battery health can send the internet into a frenzy, and suddenly everyone is convinced the battery is on its way out, turning the EV into an expensive, car-sized paperweight.
However, while there is no cut-and-dried formula for predicting EV battery degradation, there are general patterns that hold true in most cases. One of these seems to be that the rate of degradation is not linear. They tend to degrade more early on, then the rate of capacity loss starts to slow down.