It gets harder and harder for the big smartphone vendors to come up with an eye-catching new feature every year, and Apple is no exception to the rule, having been dogged for some years by accusations that it has lost its innovative touch. The iPhone X created a splash, but the firm will have to plan for more dramatic changes in future, if it is not to lose ground to the increasingly inventive Huawei, as well as incumbent Samsung and a host of up-and-coming firms from China and India. This is all the more urgent, since the company repeatedly fails to invent a whole new device which might reduce its dependence on its flagship product significantly. Tablets and watches have…