The point is: With OnShape, I’m able to wing it. Scan something, load the STL, define a few planes throughout the whole thing, freehand a few lines, extrude, offset here and there for clearance, print, forget. With FreeCAD I need to do it correctly and, as I just need a physical thing, I just don’t have the patience to find out what correctly would mean.
Snaps also can’t be mirrored locally or lifecycle controlled in an enterprise environment, as the server portion isn’t open source.