I have an Asus N56, nowhere near as powerful but similar weight. Not a huge gamer, but I love the option to occasionally game. For a certain usage cases, laptops are certainly superior to desktops. For instance, I live in a city with pretty frequent blackouts during the summer. A desktop would die instantly, but at least I have the option to coast it out for a few hours with a beefy laptop.
Roadwarriors and frequent travelers aside, I like being able to have my laptop on my desk while working, then taking it to the kitchen while I cook, bringing it to the bed to watch a movie, or having music while hanging out on the patio. I’ve never had it strapped to my back on a 40 minute subway ride, but I love being able to move it around a few meters here and there around the home and studio.
I cook on television, so to be able to have my all my notes and recipes a few feet off frame, being able to adjust according to angle, and then having a laptop fast enough to edit afterwards is pretty invaluable. Moreover, I only work three blocks away from my house, with a power brick at each location. I can deal with a few extra pounds for a 7 minute walk.
Lastly, a big chassis means that I can take out the ODD and replace it with an HDD. 128gb SSD + 1TB HDD covers all of my editing needs. Honestly, I’d rather just have it all in one package, rather than carrying around another piece, even if it’s a tiny external drive.