lawns are shit and they were actually a tool for colonialism. they quite literally came in fashion because rich people in europe were flexin with their wealth because they could spend their land and work force for lawn that looked pretty and contributed for nothing. they even took those same lawn species for america so keeo that same flexing going on.
fuck lawns. Go actually diverse meadow plants that bugs need!
also lawns are insanely unecofriendly despite being plants.
It's an issue of low density. Having single-family houses spread apart with lawns necessarily lowers the viability of methods other than driving because e.g. you have to walk farther to get to destinations, there are fewer riders per mile along the transit line, etc.
Whether you build a single-family house with a yard or an apartment building on a lot absolutely impacts density. Hell, even among single-family houses, whether the minimum lot size is 9000 square feet or two acres (real zoning categories on my city, BTW) absolutely impacts density.
You just keep insisting on missing the point, don't you? This thread is not actually about grass vs. other plants with density held equal, and never was.