Large system size on Note 5

[Markismus]

I ran out of space, cleaned all caches and found to my surprise that the System still used 18Gb. (See screenshot.)
Is this normal for Android 11 and should I start pruning the library or is this rather large? If large, how can I reduce it?

[Renate]

Originally Posted by Markismus

If large, how can I reduce it?

Lies, damned lies and statistics.
They don't make it easy to see what's going on.
My Poke3 has 7.1 GB "System", my Poke5 11 GB, my phone 16 GB.

Let's do some math.
My Poke5 has 31,331,450,880 bytes flash.
The userdata partition has 48,037,599 blocks.
That's 24,595,250,688 bytes where you can store books.
So, all the places you can't store books is 6,736,200,192 bytes.
My Poke5 has 76 non-userdata partitions that make up this 6.7 GB.
So how do we get from 6.7 GB to 11 GB?
Apparently they are counting 4.3 GB of system-related things stored in the userdata partition.
What? I dunno. Stuff like vendor, apex, odex, vdex...