I want to include interactive visualizations and other custom JS components in blog posts. I've worked with React and Svelte extensively as a frontend dev in the past so SvelteKit was the easy choice (much lighter weight than Next, et al).

It's familiarity more than anything. I've gotten around to starting a personal blog several times and abandoned each attempt because I found the blog generators like Hugo and Jekyll hard to customize. Just doing it as a static SvelteKit site eliminated all of the problems at the expensive of a few hours setting up the tech stack. This allowed me to focus on the HTML when I wanted to style the site, markdown when I wanted to write, and Svelte when I add interactive components.