What it illustrates for me is quite how thin the ocean layer is - if that ball of water was a nub of butter it would be spread very thinly over the toast of the oceans.
I find it curious to think that life on earth couldn't have evolved without that water, and curious too that
water in the atmosphere of extra-solar planets could be an indication of a life-sustaining environment. There's still some water on Mars and there may have been oceans in the past, so while it seems extremely unlikely I wouldn't completely dismiss the possibility that primitive life of some kind could still exist under the ice on Mars.
And if we can see their water, perhaps someone is looking enviously at ours... (cue Jeff Wayne).