Small or midsize towns don't generally have the political will - or budget - to massively rework lots of basic infrastructure. Larger ones definitely don't, and

Small or midsize towns don't generally have the political will - or budget - to massively rework lots of basic infrastructure. Larger ones definitely don't, and the political history of ramming through such projects is often pretty ugly. So time, effort, and treasure is spent on changes that can be politically accomplished instead.