Ukraine and its allies have much smaller stores of large, outdated dumb bombs to refit, and Ukraine has a much smaller Air Force with which to deploy them, so it makes little sense for Ukraine and its allies to build this particular solution (the West has purpose developed – or already modified – glide bombs, but, again, Ukraine’s smaller air force and not having the exact planes on which those are integrate is a bit of a barrier, though the second part is relatively easily overcome.)
> Let’s say you start pounding blocks down in the major cities in southwest Russia and see how they feel after that
Neither Ukraine nor, even moreso, its allies are interested in pounding city blocks in Southwest Russia indiscriminately. OTOH, military bases, oil infrastructure, etc. are a bit of a different story, but they are finding ways to do that without glide bombs.