I also always charge to 100% and will deplete the battery to zero when I need to (usually try to do it right before I get to a charger and run in HV before that if I need more miles). I also assume that 100% isn't really 100% of state of charge, I think all EVs do this to one degree or another, and that Honda takes a pretty conservative position, I can believe the 85% number.
I was really referring to just letting the car sit for a prolonged period of time at full charge. My father-in-law was 83 and bought a 2018 Clarity about 6 months after I bought mine. He drove it very little himself, then got into really bad health. The car sat for most of 7 years fully charged and being driven very infrequently. It now has 20k miles on it and the battery has less Ah than mine with 72k miles (essentially all of his 20k miles are battery and 60k of mine are battery). I know all batteries have their own degradation curve, but I chose to believe his had degraded faster due to sitting all that time at full charge. Maybe I'm wrong on that, but it seemed an easy conclusion. Obviously the car was babied a whole lot more than mine. I routinely get all the acceleration from the battery I can get without kicking on the gas engine, whereas his has been driven with a much lighter foot. His was always charged at 240V 20A. Mine is always charged at 240V 32A.