Honestly, managing the battery like a job is just far too much work and far too inconvenient for me. I use my devices and charge them whenever I feel like charging them. Sometimes that means I'm at 5% and sometimes that's at 80%.
I've only replaced 1 battery on my device and that was on the ill-fated 6S with its battery problems that Apple recalled the batteries on.
I mean if you did wear the battery out it is $79 to replace it. Not worth the hassle to inconvenience myself trying to "manage it".
But "you do you"