I found Server-Side Rendering in Next.js & astro a difficult sell (and I'm not a JS framework enthusiast), but this Solid JS SSR guide makes me want to consider it, maybe: https://solidjs.com/guides/server/. I really like the philosophy of one of their subpackages: https://github.com/solidjs/solid/...
This could inspire future enhancements to the foundations of my SSG, metalsmith.