No, open-heart dial watches are not inherently more complex than other types of watches. The complexity of a watch is determined by its movement, which refers to the intricate internal mechanism responsible for keeping time. Open-heart dial watches simply have a window or aperture on the dial that exposes a portion of the movement, typically the balance wheel or escapement. This design element allows the wearer to see the inner workings of the watch. While the visual aspect may add to the aesthetic appeal and require additional craftsmanship, it does not necessarily make the watch more complex in terms of the movement itself. Complexity in watches can vary depending on factors such as complications (additional functions besides timekeeping) or the presence of intricate features like a perpetual calendar or a tourbillon.