Gumroad's CEO shares their experience with using htmx for a project, but ultimately decided to switch to React and Next.js due to limitations in scalability, user experience, and developer intuition. The article highlights the challenges they faced with htmx, including implementing complex interactions and state management. Despite this, the CEO acknowledges that htmx may be a good fit for simpler projects or those with existing server-rendered applications. The decision to switch was based on the specific needs of their project, which required a more complex and dynamic user interface.