Oh sure, all batteries have loss over time, but what I think we are seeing is that the new designs loss profile is on par with other BEV manufacturer's batteries.
My 2018 is a year and a half old, and it still has the same range profile as when new. We quick charge exclusively these days, and the range is still between 145-175 depending on the time of year.
2018 LEAF SL
Delivery April 10 2018
2014 LEAF SV
Delivery May 23 2014
50,000+ miles - all 12 bars - Same range as new - No warranty issues ever!