Listen I agree with the sentiment, but certain grasses are much more invasive than others. Like I would have to rip out KR bluestem on sight if I saw a seed head coming up, whereas St. Augustine is also invasive but dies away in a flash without artificial irrigation so not as big of a problem. If I were to let my yard go without easing into controlled reintroduction of native grasses, herbs, and wildflowers, I would just get overwhelmed by KR getting blown in and self sowing into the dead patches of bare topsoil.