Was thinking the same thing. By this standard, in time we’ll have the Unfathomably Large Telescope, the Brain Hemorrhageingly Large Telescope and the So Large That It Seems To Make Reality Crack At The Seams… Telescope.

I think it’s because of the same reason we limit our search for life to water filled planets. It’s just easier to examine properties that we have studied and know about, considering the vastness of the universe. I agree with you though the possibilities of vegetation existing in multi colours as well as life forms beyond what we know is far more interesting than other earth like alien worlds.