There are hundreds of lovely native shrubs, perennials, ground covers, ferns and more that aren't available at home centers. It may take some investigation to find them, but the results are worth it.
Native plants from your area and habitat are well suited to the climate and soils, so once they're established you don't have to constantly water or adjust the pH of the soil. They are often more resistant to local pests and diseases, so there's no need to spray for pests.
Learning which plants and animals are native and how they interact can help build an appreciation of all environments. Supporting a bit of wild garden can remind you of the wonderful complexity of life every day, with no need to burn gasoline and drive for hours to see a butterfly or hear a frog-just step into your own backyard with a nice cup of tea and watch life go by!
Allowing a corner of your yard to go native reduces or eliminates water and pesticide use, and provides a place for wildlife even in the city. It can help break up the 'grass desert' which has so reduced the variety of birds, insects, and other wildlife. There's also less risk of introducing invasive alien species such as English holly, English ivy, purple loosestrife, and others that can devastate wild areas when they escape (and they do escape!)
Our Pacific Northwest native plants have evolved for millennia along with the thousands of other species which live here. A single plant species may directly and indirectly serve up to 50 other species of fungi, insects, invertebrates, and other organisms, not counting the larger wildlife such as birds that eat those fungi and insects. An exotic berry shrub may feed a few kinds of birds (often non-native starlings) while it's in fruit, and perhaps two or three kinds of insects during other parts of the year, but compared to the rich and complex relationships of a native plant, any exotic species is a distant runner-up for providing habitat.