Lawns are fine. Having lawns and nothing else is a problem. Filling your lawn with chemicals is a problem. Most people I know who have lawns don't do that. They also have rich borders and beds and planters and wild areas. I post a different pic everyday here of bugs I find in my garden; the grass and clover and soil itself is full of life. Most people need an open space to play or entertain or whatever, and a lawn - though not a wildflower meadow - beats decking or concrete.