Lots of people pencil sketch before they paint. It's not at all odd to whip up a prototype, a sketch of the final product. You could do that with pen an paper,

Lots of people pencil sketch before they paint. It's not at all odd to whip up a prototype, a sketch of the final product. You could do that with pen an paper, in Figma, code vibe it, or whatever solution is quick and dirt for you. I've worked directly on consumer software used by hundreds of millions of users and many people I worked with prototyped in various ways before scrapping it to write production code.