Blessing on Budding Fruit Trees ("Birkat Ha'Ilanot")

During the month of Nissan when one sees a blossoming fruit tree, we make a blessing thanking G‑d for giving us trees that grow fruit.

Kabbalah teaches that the blessing upon blossoming fruit trees can redeem souls.

A special mitzvah, which can be fulfilled only once a year, is to recite the berachah ("blessing" or prayer) made upon seeing a fruit tree in bloom: Blessed are you G-d our G-d, king of the universe, who left nothing lacking in His world, and created ...

As I mouth the words, I feel every fiber of my being rebelling. He has not made His world lacking? Not lacking in anything?