Is this still applicable ? I was reading ios 14 already limit overnight charging to 100 percent. It will stop charging and if go down 99 it will charge again so you always get 100 percent when you unplug

Many contradicting theory but i usually charge when it reach 20 percent to 100 percent

With iOS 13 and later, Optimized Battery Charging is designed to reduce the wear on your battery and improve its lifespan by reducing the time your iPhone spends fully charged. When the feature is enabled, your iPhone will delay charging past 80% in certain situations. Your iPhone uses on-device machine learning to learn your daily charging routine so that Optimized Battery Charging activates only when your iPhone predicts it will be connected to a charger for an extended period of time. The algorithm aims to ensure that your iPhone is still fully charged when unplugged.