Designers create light and dark theme one page site wireframes for several reasons, including:
Planning and prototyping: Wireframes help designers plan and prototype the layout, structure, and content of a website before investing time and resources in the design and development process.
Collaboration and feedback: Wireframes allow designers to work with stakeholders, including clients, product managers, and developers, to gather feedback and refine their ideas before moving forward with the design process.
Clarity and organization: Wireframes help designers clarify the structure and organization of the content on a website, making it easier to communicate their vision to stakeholders and ensure that all elements of the design are aligned with business goals and user needs.
User experience (UX) testing: Wireframes can be used for UX testing to identify and resolve usability issues early in the design process, before the design is finalized.
Having both light and dark theme wireframes can be helpful for designers as it allows them to explore different visual design options and understand the impact of color and contrast on the overall look and feel of the website. This can be especially useful when designing for accessibility, as different color schemes can impact the legibility and readability of the site for users with visual impairments.