You don’t need to clear the phone system cache if your phone running smoothly. Clear your phone system cache when you experience issues with your phone systems operations, performance or functionality such as lagging, memory issues or issues running apps.
For additional information see: Why Should I Clear the Cache on My Phone?
For additional information on clearing the app cache see: What is the Difference Between a System and App Cache Wipe? and How to Clear App Cache on Android
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