Is system root possible on S20 Ultra, or even on Android 10?

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Jun 16, 2015
I have an S20 Ultra that is rooted with Magisk, but it cannot write to the system partition, which means that I cannot convert a user app into a system app that will survive factory reset. I have read some threads that suggest that it is actually impossible to write to the system partition at all on Android 10.

Is this true? Is there any way around this?