Ive done some line clearance too and from my experiance, a lot of it depends on the power company vs. personal opinion.
The p.co's ive worked for really just wanted their clearance and like has been said, didnt care about the look of the tree. However, it is our companys interest to make the best of what you have to do. If that means taking an extra 6-12" to leave a leader.......so be it. Sure its a little bit larger cut or more brush to haul, but its leaving a proper cut. Thats were an arborist is concerned. Sometimes too talking to the homeowner to let them know what you will be doing and that you'd like to take more than the standard in order to make a proper cut will win you that freedom. sure the tree still looks butchered, but it may also be stub free. I think its the presence of stubs that makes the trees look the worst.
As for planting the proper trees under lines as Dad suggested, I dont even like the smallest of trees to go there. Nothing should be planted under the lines.
As for the home owner that puts one there, I think it is up to the nursurys and home stores selling trees to hand out literature telling people to LOOK UP! before planting. Maybe some do, most of what I see DONT.