You are wrong. This feature is needed in Universe Sandbox 2. Soon, when planet grids are released, it will open up many new possibilities relating to temperature, height maps, elevation and many other features relating to clouds, oceans, sea floor data, and even earth quakes and volcanoes.
This feature will not be too resource intensive because developers will figure out a way to improve the performance of simulations in Universe Sandbox 2 as well as the improvement of climate mode.