When you do the initial setup it asks if you'd like to optimize for battery health and most people say yes. Most recently it wouldn't even tell you that it was only charging to 80%.It would still charge to a hundred but that would actually be eighty percent. Around a year ago they changed it so now it says eighty percent when you're at full charge if you have the battery health turned on.

If you turn on the battery over provisioning you would see the same battery life at about a year and a half and then after that the provision battery will last longer. After the exploding phone they also provisioned five percent of all batteries.

It's all up to where you live and how you use the phone.

One day heavy usage is the goal. I charge my S24 to 80% but only lightly call, and moderate chatting. I can make it from 6am to 8pm and still have well over 25% when I get home. Little to no gaming or social networks though.

It helps that I live and work in an urban area with good antenna coverage. So the phone doesn't use too much power talking to the network. People who live out in suburbs and rural areas have worse phone battery life because the phone has to struggle talking with antennas further away. Battery life is complex and it goes beyond what personal anecdotes can show.