People who charge/discharge between 20-80%, how's your device?

I usually limit it to 80% during the summer, but because I work outside and through the night too my battery can reach very low temperature levels which absolutely hammers my battery life so I let it charge to 100% / or just to warm it up via a small powerbank on my FLT sometimes during the winter months.

As for longevity? I usually go through a phone every year or two so I don't see the wear of of what others are saying in here using their phone for over two years (that's my max), but I feel the 20/80% guideline is a fair one to go by since the reported 100% isn't fully accurate anyway.