I have a model in ArcGIS 10.3.1 which splits a large (> 1,000) polygons by a road network (as polylines). Currently, I am using Xtools' Split Polygons, but this would require an end-user to have a copy of XTools which I need to not be a requirement. I have found this tool, but, when I have tried to use it, it takes a very long time to run (much longer than the XTools equivalent). Does anyone know of any other tools which do the same thing, but are not locked behind non-ArcGIS purchasing licenses and are ideally only using ArcGIS geoprocessing tools?
Have you tried "Feature to Polygon", advanced license required? This tool will Cut Polygons with a Polyline FC. If you don't want the Road Network creating new polygons, first Clip the Road Network by Polygons so you are only dividing or cutting the existing Polygons.