Maybe somem to do with the grid quad setting.
I noticed “extrusions” do have less ‘isocurves’. I always thought it was weird. I think I turned off ‘extrusions’ a couple days ago. … as per Why do extruded fillet curves result in polysurfaces instead of surfaces? - #4 by davidcockey .
Not sure what the theory behind ‘extrusion objects’ is supposed to be lol. Maybe, less surface count… idk.