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.

Most lawn if left to nature will resestablish. Invasives actively repel an areas natural species and take space from them forcing them out.