Attempts of research to define the best ratio of land and the ocean for a habitability ekzoplanety

The earth consists approximately for 29% of land and for 71% from oceans. This combination for a habitability is how important? What does it speak to us about a habitability ekzoplanet? On Earth there are not enough places where life cannot be fixed. The general habitability of our planet is influenced by a set of factors: abundance of liquid water, techtonic dance of plates, volume structure, proximity to the Sun, magnetosphere etc. What role is played by a ratio of oceans and land? At present our understanding of a habitability quite rough though it is based on proofs. We rely on a manned zone round stars to find the potentially manned...