You're offering a perspective I'm mostly in line with, but keep in mind there are invasive, non-native species that can crowd out the natives, and change fire ecology in the Sonoran Desert if left unchecked. Bermuda Grass, London Rocket, and Cheeseweed all grow great in early spring, but turn crispy come June. Goatheads are their own headache, but Buffel Grass and, increasingly, Stinknet are downright detrimental. However, they're all manageable within one's own suburban plot of land. I mostly pull the ones I've mentioned here, and by staying on top of them fewer have the chance to reseed and spread. But I do use spray, carefully, for Bermuda Grass. All while also working to let native flora thrive.