This division of duties sharpens focuses and helps designers avoid multitasking, leading to optimal product development. You can be sure that you do not sacrifice either attractiveness or convenience, because UI and UX specialists promote diverse perspectives. As a result, you get the most effective combination and higher task completion speed. Yet, hiring of one person, a UI/UX designer, would be a wiser step for smaller projects and seed-stage startups, as, in those cases, you may not have enough tasks to fill the working time of 2 people.