Google has updated the storage page with Android 15 Beta 2. The “System” option has been turned into a header. The OS and temporary files have been separated.

In the reviewer’s guide for Oxygen OS 15, OnePlus says that “Oxygen OS 15 on OnePlus’ next generation flagship phone achieves a remarkable reduction in system storage, shrinking by nearly 20 ...

Whole storage dramatically impacts system performance beyond individual apps. Android's built-in storage analysis tools help identify space-hogging applications that may need attention.

Google's requirement states that 75% of the total storage on a device must be dedicated to the Android's main data partition, which comprises the operating system, apps, and user files.