I find it a rather offensive that the suburbs don't have walking/bike path cut-throughs. They're cheap. They can cut down on non-car travel by a ton. They're just damn nice.
Some do. It all comes down to whether the local government cares/thinks about this when setting up ordinances and approving PUDs. I was also appalled when I moved from a place that did this to one that didn't. There were so many obvious opportunities to improve connectivity with a few hundred square feet of easement.