Power
There's not much power here. Even after a few years, most new landscapes aren't as impressive as they were originally designed to be. Some of those cute, innocent-looking trees that you called for will eventually grow to impressive stature, housing millions of bees, wasps, and angry birds.
And then there's the total lack of recognition. Even the best landscapes don't get as much attention as they deserve. In fact, many of the best landscapes are designed to blend into their surroundings or subtly buffer the architecture of the buildings they adorn. Until someone figures out how to restore the Garden of Eden, landscape designers will continue to get less credit than they deserve.