Agreed. I was fanatical and obsessive about Accubattery, compulsively checking it for my phone's health. The alert was nice that let me know it was charged to a certain percentage, something that my Samsung does (85% cap), but my Pixel doesn't.
I still try to stop charging at around 80-85%, but I haven't installed any apps to help me with this process, and if there are days I know I'll need more juice (trip to Disneyland, day at the beach), then I'll excise a full charge.
I'm always so torn about using my phone as GPS though, as when I do, it's often as GPS for long drives, along with being the device I use to listen to videos on YouTube to. It's such a battery drain, but I've also read that you shouldn't charge and use your phone at the same time. In addition, it's usually on the dashboard, meaning it's exposed to the sun the entire time. My workaround has been to use a phone until I round 30%, then just switch my SIM into another phone at a rest stop and use that while the other phone charges. My wife laughed at my obsessiveness, and I agree...truly, it's a 1st world problem.