An important but often neglected fact is that privately owned cars spend only a small fraction of their lifetime driving. Long, continuous rest periods of hours (at night, while at work) or even days (over the weekend) are part of most realistic usage scenarios.

I agree. For example, in Closed-loop optimization of fast-charging protocols for batteries with machine learning, cells were cycled non-stop to make lifetime predictions and choose the best fast charging protocol.

Reasons for Cell capacity recovery during rest

Anode overhang effects can increase measured cell capacity after rest at 100% SoC

Frequent rest recovers capacity and prolongs a cell's life

"Bumpy" voltage relaxation indicates Lithium plating

References

https://www.sciencedirect.com/science/article/abs/pii/S2352152X18308053