If the earth's landmass was flat, you don't need as much water to cover the continents. If the earth had just "recently" cooled from being a ball of magma, it

If the earth's landmass was flat, you don't need as much water to cover the continents. If the earth had just "recently" cooled from being a ball of magma, it makes sense that there weren't major upheavals yet. It was only after significant tectonic motion, subduction, etc, that you got the variety of geographic terrain and continents we have now.