In this article by Kenji from serious eats he discusses forming the patty to a bare minimum so the strands of ground beef are still visible. He also recommends only salting the beef just before making it. Both strategies to avoid toughness.
In this video by Gordon Ramsay (and other burger videos by him) he completely mushes up the mince to turn make it completely consistent. He also adds salt and a bunch of other flavourings, which a lot of people don't recommend.
So who's right? Assuming Kenji is right in his assertions, why would Gordon do that to his burgers? Is it true that the meat should be just formed and otherwise left alone?