I wonder if Apple could help improve this by adding a battery charge threshold setting? Some manufacturers include settings where you can indicate that the laptop doesn't begin to charge until it reaches X% (such as 60%) and will stop charging at a max of X% (such as 98%). Supposedly this helps reduce the amount of charging cycles, but I am not sure how significant the impact is.
With Apple batteries being glued in and not easily replaceable, maybe any reduction in cycles is a big positive.
My 2012 13" non retina MBP was purchased new at BestBuy in July of 2015. It has 28 cycles and it is at 90.7 capacity. It's been that way since about 15 cycles. I use it on battery about once a month just to use the battery.
battery charge state is an estimate made by watching current flows or voltage. This is effected by load, temps, and other environment conditions. There is no way to know exactly how much charge a battery has and how long that will last. Better to not get hung up on 3-4% differences.
Batteries degrade over time, regardless of cycles.
Every now and then we'll see a thread with someone's 2015 Mac has 30 cycles because it was always on the charger and the battery has degraded to 90%. No ****.
If you store a battery, it will degrade over time.
If you use a battery, it will degrade over time.
If you only use your Mac on a charger, it's even worse, because you're "storing" a battery at full capacity in 40-50C heat.
If you use it every now and then, it will degrade but a bit less.
Honestly mine looked like it was going to be quite low if it followed trends much like OP's did. After a year I was around 95% or so. Just over 5 years now and my battery is at 86% capacity and with 675 charge cycles. It's not a linear process and you'll probably be fine.