Earlier quoted context omitted.
Why? It's the most efficient use of resources and allows for some great cultural and public infrastructure to exist that just doesn't make sense without density.
Is efficiency for the sake of efficiency worth it though? There's a second order effect I observed which I feel isn't discussed enough: when it's assumed that you can only walk/cycle or perhaps take the bus in an area, suddenly there's an additional premium imposed on space. The net result is accelerated gentrification. Anecdata: just about anyone I know from my generation was priced out of those walkable districts w…
The solution to that is not "let's build more undesirable neighborhoods so prices are not increasing" but to change zoning regulations so more dense neighborhoods can be build to satisfy demand!