re: Fleet of Worlds
Another aspect of world covered with water is what is topography of the ocean floor.
A smooth even terrain would argue against there being any life. If uneven terrain, what would is the limiting factor in "mountain" height and valley depth.
Add say 6000' to our oceans, does this add around 5000' to mountains heights- because water is reducing gravitational forces which limit our mountains in terms of their height.
What happens if we were to have twice the tidal force that Earth has?
If a planet has active plate tectonic and has oceans, what would prevent continents for forming. Isn't the answer simply a lot more water than we have on Earth? You would still have continents on this world but the would simply be underwater.