That being said we picked a suburb that is actually quite walkable for our daily needs due a good public trail system and being adjacent to a large community college campus.
Detached homes, especially the lovely ones with mature trees and gardens, require a lot of work. Things like snow removal, leaf pickup, scrubbing mildew off the siding, tree trimming, concrete repair, roofs, hvac maintenance, cleaning and servicing multiple vehicles, and the list goes on. And of course older homes are booby trapped wrecks of lead, asbestos, cloth-insulated wiring, corroded pipe, and shoddy insulation. Naturally, in many desirable locations old is the only affordable type, too.
strongtowns.org has ongoing research that shows most suburban communities are not self-sustaining as a tax base and rely on nearby cities and outside investment to support their infrastructure.