It's sad, for example, to see so much discussion of the Mission in San Francisco (which is already quite dense, by any standard short of "midtown manhattan"), when the western 3/4ths of SF (much of which consists of wealthier people in suburban-style mansions) is routinely ignored. And though I believe that YIMBY people do want to raise height limits and density everywhere (good, fine), in practice, the debates usually center on re-development in poorer neighborhoods, since it's an easier political lift.