Gravity pulling to center of mass would not allow a sphere earth to have rolling hills.
Pure BS!
If you wish to assert such nonsense you will need to back it up.
You also need to explain how you magic downwards force for a FE somewhow allows it but RE doesn't.
Again, the same arguments apply for RE and FE.
That's easily formed into a sphere with gravity pulling to center with a centrifugal force in effect.
Again, PROVE IT!
So far all you are doing is repeating the same baseless assertions.
You have provided absolutely no justification for your claims.
Gravity pulls to the centre, not magically smooths.
Just like a hypothetical magical downwards force for a FE pulls downwards not magically flattens.
You need to have that force somehow transfer to a sideways force.
Like I explained before, the 2 ways for this to happen is a loose particle on the surface being subject to the normal reaction force which has a component going sideways down the hill which overcomes the frictional force or other forces holding it there; or for the pressure from the weight of the hill to exceed the yield stress of the material which then pushes it out sideways.
And again, this is the same for a RE and a FE.
The only difference will be the final shape.
If a RE demands a perfectly round Earth, then a FE demands a perfectly flat Earth.