Arcade expressions provide a powerful way to visualize your data in ArcGIS Pro. It inherently has its limits. One of these seems to be to import symbology based on an Arcade expression from one layer to another using the tool 'Apply Symbology From Layer' (also known as 'Import Symbology').
This would be handy in many cases where changing the datasource isn't really helpful, for example where other attributes differ a lot between layers or there is other configuration like labeling and pop-ups that make chaging a data source less optimal. Symbology may be complex as well, which would make it time consuming to build it all over again.
My idea is to allow symbology based on Arcade expressions to be imported from one layer to another.