When you join two shapefiles on spaitial location and summarize (ie, add all points within a polygon) it automatically adds "Sum_" or "Count_" to the start of your field header. So what was once a meaninful Cenusus header B01001_1 becomes "Sum_B01001". Making it very difficult to retain what the field originally was.
Users should be able to elect if they and the "Sum_" added to the start of their field headers.
The Spatial Join field map parameter allows for the control of output field names. So you can summarize all of the point attributes into a polygon, and give the field whatever name of your choice. Learn more about the field map in Spatial Join here:
https://pro.arcgis.com/en/pro-app/latest/tool-reference/analysis/spatial-join.htm
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