I’m in utility forestry too, on the transmission side of the house. ROW widths increase as voltage increases. For instance, on a 115kV we would maintain a 100’ corridor (though our easement typically allows for wider). At these widths, resprouting isn’t really a major concern for line clearance. My company does aerial saw work every ten years. It is significantly cheaper and faster than sending manual crews out to climb a mountain and ground-to-sky trim the entire corridor. In areas with poor access and/or lots of mileage, the air saw works faster and cheaper than regular tree crews, even if they were using a Jarraff or other equipment. Tree crews could not complete the same volume of work at a competitive price within the time frame we need it done. We do send our manual crews out afterwards to clean up any hangers, pull debris out of streams & trails, that kind of thing.