It’s been a while since I felt a profound case of gadget lust at CES, the tech trade show that takes over Las Vegas every January, but that’s what happened when I picked up Lenovo’s Legion Go S gaming handheld. I’m already a satisfied Steam Deck owner , but the Legion Go S has a larger and sharper screen with 120Hz refresh rates, AMD’s new Z2 chipset, and—to my hands, at least—perfect ergonomics. It also runs SteamOS, and Valve’s plan to license...