It would be great if in the field mapping part of the associated geoprocessing tools, the unmatched fields could once again be highlighted in red. This used to be the case in both ArcMap and I'm pretty sure previous versions of ArcGIS Pro but it seems to have fallen off in my current version (3.0.3). Just having the (0) at the end of the field means more looking and reading to see which fields don't match and if the field names are long you have to resize the whole geoprocessing pane to get to the end of the field name to see if there is a zero there or not. Previously is was super easy just to drag the scroll bar down to quickly see if there were any unmatched fields.
Just a small thing but if you are redesigning field mapping (as I see you are in other posts) can you just put this back as well?