The what's new documentation as linked below describes the enhancement of incorporating pipeline devices and junctions into the UN for use in overlay events. We would like to see that expanded to Structure Line. Key regulatory requirements exist that rely upon knowing whether a segment of pipe is cased. Adding structure line as a participating feature would add a lot of efficiency.
Article in question: https://community.esri.com/t5/arcgis-roads-and-highways-blog/what-s-new-in-arcgis-roads-and-highways...
