I view my lawn the same way as the author, in that I do want there to be a good amount of biodiversity there. I let everything grow in the yard sections and even have parts that I leave almost totally wild without even cutting. But I also don't want weeds growing in the cracks between my paving stones, or poison ivy growing anywhere, and there's not a whole lot that works on knotweed! So I don't use a ton of Roundup but I do use a bit here and there. In moderation is again key but doesn't seem to fit into anyone's ideological framework these days.