I’m deeply conflicted about the Dyson Spot + Scrub Ai robot vacuum and mop . It’s the company’s best robotic floor cleaner to date, with excellent mopping performance, good navigation and obstacle detection, and a multifunction dock that takes much of the busywork off your hands. But Dyson’s first attempt at a vacuum-and-mop combo is a worse vacuum than its predecessors, and that’s because there’s no Dyson motor in this vacuum . You read that right. For $1,200, the Spot + Scrub doesn’t get you a Dyson vacuum; instead, you’re getting a third-party motor and brush system. “It’s not one of our V10 motors, it’s one of our partner technologies,” Nathan Lawson McLean, senior design manager at Dyson, told me.…