It's been a while since I last looked at Attribute rules, and the last time, the geomerty features weren't really....useful. Now it appears you CAN fire attribute rules based on geometry relationships with other layers!
Looking at the example here Attribute Rules: What’s new in ArcGIS Pro 2.3 and ArcGIS Enterprise 10.7 , I see I can do a buffer and intersect spatial query, and Geometry Functions | ArcGIS for Developers shows that within is possible, but just a count of within. What I'm interested in doing is calculating a field of a point based on what polygon it falls in. E.g if point is within the sasquatch territory polygon, the bigfoot field gets "yes", if it falls within the yeti territory polygon, it gets "no". Is this yet possible with Pro and Arcade? I think not? Any examples of this type of attribute rule?