Fernando Poumian's decision to create his blog using Gatsby and Contentful stems from his desire for a platform that offers control, cost-effectiveness, and scalability without the traditional drawbacks associated with monolithic Content Management Systems like WordPress. Poumian, a web developer, critiques traditional CMS platforms for their lack of control, security issues, and potential costs related to hosting and maintenance. He finds Gatsby.js appealing due to its React-based static site generation, which, when combined with Contentful's headless CMS capabilities, allows for flexible content management and rendering. The integration of GraphQL with Gatsby enables dynamic data querying from various sources, enhancing the site's flexibility and performance. Poumian also appreciates the continuous deployment and hosting services of Netlify, which complement the static site architecture by providing a robust, scalable, and cost-effective hosting solution. His experience points to the potential of combining modern technologies to create a blog that meets the needs of both developers and users, anticipating a future where web development becomes more secure and efficient.