A fresh photo every day
If you are bored of staring at the same lock screen, turning on automatic rotation keeps things fresh with minimal effort. Point it at a travel album and you get a little dose of nostalgia every time you check the time.
Battery and performance
Rotating your wallpaper does not noticeably affect battery life under normal settings. Only very short intervals, changing every few minutes, use a small amount of extra power, so a daily or hourly interval is a safe default.
Frequently Asked Questions
Does automatic wallpaper changing drain the battery?
Not meaningfully at normal intervals. Only extremely frequent rotation, such as every few minutes, uses a small amount of extra power.
Can I set different rotations for the lock screen and home screen?
Many newer phones let you configure the lock screen and home screen to rotate independently, using different albums or intervals.