The 15-inch version of the Surface Laptop 3 represents the biggest change to the clamshell laptop since Microsoft launched the first Surface Laptop in 2017. And yet, it is remarkably similar to the prior models, despite the fact that it’s bigger and has a completely different processor. That similarity has made it difficult to determine who exactly this version of the Surface Laptop 3 is for. It’s not as light and portable as the 13.5-inch Laptop 3, Acer’s featherweight Swift 5, or LG’s Gram 15. At the same time, it’s not nearly as powerful or capable as many other premium-priced 15-inch laptops, such as Microsoft’s own Surface Book 2, the Dell XPS 15, Apple’s MacBook Pro, or any number of 15-inch gaming laptops. After spending about a week testing it, I think the $1,199 ($1,699 as tested) Surface Laptop 3 15 is for someone who likes the design and build of the other Surface Laptop models, but feels too constrained by the 13.5-inch screen. Or maybe it’s for someone who really likes a 15-inch 3:2 aspect ratio screen, but doesn’t want to lug around the monster that is the Surface Book 2. Aside from its strange positioning among laptops currently available, the Surface Laptop 3 15...