This is a cart that can climb on its own - which means the person pushing it can climb independently. There's a class of conditions where this combo can work, and wheeled cart won't. Whether this class of conditions is something you'd encounter in practice (as opposed to adapting things to make an existing alternative usable) is another thing; I outlined some potential niche use-cases here[0].
Sure, and this is terrain-following aerial drone tech that also keeps a cargo platform balanced, so why not use it to fly up/over the terrain rather than follow easy path?
