These fixtures are actually known as path/spread lights and are made for more than path lighting. High end landscapes are designed with seasonal color to be changed out a couple of times a year. The path/spread light fixture is used here to accent this seasonal color and fill in between other lighting accents. This is good lighting design.
If the home owner does not maintain their landscape, it's not the fault of the lighting designer. I have used this lighting design many times and will continue to do so. I do let the home owner know why I am using this technique and that they need to continue to maintain their landscape.