Isn't it nice? That's been carefully selected/managed by the HOA with the help of an ecologist. An effort which I have been managing since I joined the board 8 years ago. None of the yards are just no mow because you can have both tidy lots and natural spaces. We don't just leave it and see what happens.

Edit: What's growing there is intentional, and generally where it's growing (as a natural boundary and erosion control feature) is.