It's not just alone the paths, but also near distribution stations, which are closer to urban areas where you can't do burns. Some lines are close to urban area

It's not just alone the paths, but also near distribution stations, which are closer to urban areas where you can't do burns. Some lines are close to urban areas. Some areas can't be burned at all because the smoke always hits urban areas. And before you can burn you have to clear a long way from the power poles themselves so that they don't get damaged. And so on. Controlled burns aren't all that controlled in reality. It's hard to do in places that are near human settlements. (I do disaster planning work in Australia, and while I'm not an expert on bush fires or controlled burning by a long shot, I don't see why those things would be different between the two places).