Is a CSR site always bad for SEO?

Not always, but CSR can be less reliable for crawlers and social previews. Build-time prerender (SSG) helps by shipping HTML per route.

What technical issues most commonly break indexing?

Accidental noindex, wrong canonical, robots.txt blocks, returning non-200 status codes, or requiring login to see main content.

If you generate per-route HTML via prerender, avoid a catch-all SPA rewrite that serves a single index.html for every route.

Technical SEO is about making sure search engines can crawl, render, understand and index your content — while users get a fast experience.

CSR: simple architecture and strong interactivity, but crawler rendering can be less reliable
SSR: request-time rendering, good for dynamic pages but adds runtime cost
SSG/prerender: build-time HTML per route, SEO-friendly and cheap to host

For Cloudflare Pages, SSG/prerender is often the best tradeoff.

Rendering and indexability questions.