The biggest limitation for these arms is weight: Roborock’s can only pick up light items up to 300 grams — it’s currently programmed for socks, tissues, small washcloths, and sandals. Dreame says its will be capable of up to 500 grams, which means it can tackle shoes ( a sneaker up a men’s size 42/9). But only Roborock actually demoed its robot picking anything up — and that was just a sock.