My comment and current workflow has nothing to do with TGC. And FYI, that isn't how TGC ever operated anyway.

Those issues with multipolygons and multiple relationships are when you use the OpenStreetMap Overpass API. It has nothing to do with data size and "overhead."

This is why I do an initial spine in ID, then download the area and work in ArcGIS offline. If I need to vast changes to OSM data at that point, I will do that in JOSM offline. 
