I can certainly share that feedback with the team, but I did confirm that this is the intended behavior for the software. It is performing as designed. If you use different settings for the top layer (speed, flow rate, spacing, etc), then those regions need to be printed separately from the regular solid fill. Otherwise you would be extruding at 200 mm/s, 100% flow, but then expected to immediately slow down to 50 mm/s and potentially 120% flow in the same movement. The flow and speed cannot change this quickly, so the solution is to print these regions separately with the exact settings that you specify.
If you do not want to print the regions separately, then the top layers cannot use different properties than the regular solid layers. So set them both to use the same speed and flow rate, then the division will go away.