Great post, Steel. As someone who owns a de-porched house, I long for the day that we can rebuild it. Full, usable porches (as opposed to useless ornamental porch-ettes) are one of the primary ingredients that turns a collection of free-standing houses into a neighborhood.
A street of de-porched houses, or houses that never had them to begin with, feels vaguely anti-social in ways that just might have real-life consequences when it comes to nuisance crimes like carpoppings. I don't know that there is a statistical connection, only that I wouldn't be surprised if someone found one.