That is usually due to thieves, not the light fixtures themselves.
One time the Duarte Bridge in SD was completely maintained and basically, the bridge was left "like new." It was very lit from end to end with fancy new light fixtures that the actual light faced up and the lighting would reflect from a metallic "roof." Well, that didn't last long. The thieves were not content stealing the wires, but they also stole the lighting, each and every single one of them.
Something similar happened to the Mauricio Báez Bridgr in San Pedro de Macorís, though there it was that the bridge was new. In addition to that, every light fixture had a solar panel. Even the panels were stolen.
But, with that said, there are many places I remember as a kid that had dirt roads and not anymore, and were completely dark because there was no lighting or street lamps and now they do exist. In the same token, I remember when most houses were made of wood and that is no longer the case and that wasn't a very long time ago. SD hardly had highrises and now even SDE and Santiago has a small skyline of highrises in some areas. Traffic jams were unheard of in many places. Many changes.