Another behavior that masks battery capacity loss is not driving your car very far. I've noted a number of folks posting recently who drive less than ten miles a day and charge infrequently. They have been asking about strange LeafSpy results; cells way out of balance, Ahr readings that seem too high for older Leafs, etc.
I'm convinced that it is important to run the battery down to VLBW or below once in a while, maybe every three months. And then recharge to 100%. What this does is give the battery management system a chance to measure how much capacity the battery really has. The charge to 100% helps the battery perform cell balancing. Yes, staying in the 30-70% charged region is probably best for battery life, but if you never exercise the battery fully, the BMS is going to lack important data.
In my case, my car was reporting three bad cell pairs on the CVLI test this summer. After three days of charging and discharging enthusiastically, the problem went away and hasn't come back. More recently, my Ahr and Hx readings froze for about three weeks. After running the battery down close to turtle, the BMS updated the numbers. They say that my battery continues to degrade, but at a much lower rate than it did last summer.
If your battery is behaving oddly, you need to use it more!
-Karl