The Namib is also home to this rather strange but extremely adapted plant: Welwitschia – https://en.wikipedia.org/wiki/Welwitschia
If you've ever actually lived in or explored a desert, you quickly learn that they are full of life. More than most urban landscapes.
It is a spiritually rewarding activity to look out over a landscape, be still for a while, and notice the absolute abundance of life, as robust as ever.
Even in the dustiest Earth voids, there are colours and growth. It pays to look for it.
This is only true if every piece of life requires the exact same amount of water. Which is false. Your argument easily falls down simply by noting that a river has less life than a rain forest.
Is that true? What is your source for that?