Having a simple website design has its own advantages and can beat easily the complex websites. Considering elaborate designs is not wrong, but the simplicity of designing ensures fast functioning and wins out easily. With simple designs the conversion rates are fast and satisfactory.
The complex designs in a website may look grand, but there are more possibilities to get jammed as in a small space the information stuffed is much that the website loading becomes slow. In fact, the navigation also becomes confusing. This is the reason that the conversion rates are not as expected and appears very slow.