With respect to charge cycle, all of it is still a bit confusing to me also. However, I read a somewhat decent article somewhere that said a charge from 0 to 100% is equal to one charge cycle, and from 0 to 50% is a half a cycle, 0 to 25% a quarter, and so on (so if one normally charges from 0 to 80%, then in theory each time only 4/5ths of a cycle will be "consumed" from the perspective of overall battery deterioration and theoretical number of maximum charge cycles).
Right now, I have all fast charge settings disabled (I don't seem to ever need such) in the hope of minimizing stress/heat to the battery, and I have a routine that stops charging at 95% and flips the phone over to maximum battery protection mode (which would normally stop the charging at 80%). So, basically a custom stop and maximum charge to level less than 100 but higher than 80%. If I could (via routine) also dial back the power/volts/amps that might have to ramp up beyond 75/80%, then I would love to also control that.
I might go back to simply just using the default maximum protection mode (limit charging to just 80%) because the current battery state of my device is quite good and I can normally get through a few days. However, I also agree with what someone else said in here in another thread, in that it would seem to be odd to decide to buy a premium phone and then out of the box purposely want to avoid using 20% of the spec'd capability.
Also, my view on charging has changed recently based on various things I've read. For all my devices, I try to now think/use them differently and if I can, basically never aim to charge them to 100% but instead only just charge them as and when required and up to a certain charge level that will confidently get me through a next block of time. Obviously, I don't want to have to be putting my devices on chargers too many times a day or a week, as that would also be odd to have to do with devices. However, I do now try to avoid thinking about aims to always have high charge levels, and I try to instead be content with my devices often just being somewhere between 15 and 80%. For me, I think one killer can be charging when sleeping, when devices are on the charger way longer than they have to be.