That flashing was cut like that to get it around the pipe imo. Unless your power company comes out to disconnect the service and lines, you cant get a flashing on it. Why did not have a good flashing already, i dont know. I rarely see it, but its out there. Most of the time on a re-roof, the tear off crew needs to be very carefull around the power pole for this reason. If they damage the flashing, your stuck buying a retro kit to remedy the issue or call the power company. Your roofer took the fast way out on that one.
I agree Andy. What's weird (and annoying) is that when I replaced the electrical service a few years ago, I put in a nice new flashing, with a rubber seal around the pipe. Then when I had the house reroofed later, the roofers took out my flashing for some reason and put in their own. I didn't think much about it at the time, not realizing that they replaced my nice flashing with a crappy one. Oh well.
I know you can't see much here, but I did find a picture of the reroof project. When I zoom in on the flashing, you can see that they took my flashing with the rubber seal and pushed it up the mast. I don't know at which point (or why) they tore it out and put in their crappy flashing .