I have encountered several circumstances where I was wishing I was able to run arcade expressions directly in a python script.
Since attribute rules only support arcade a lot of time has been spent building expressions and logic in the form of arcade expressions.
Then later on when building an automation workflow I have had to incorporate some of the same logic and had to completely rebuild the script using Python commands instead.
My thought is this, similar to how you can run SQL scripts inside of a Python script, create a way to pass arcade expressions inside of a python script to perform logic/analysis on the data and pass the output of the arcade expression back to the python script.
Would love to see this!