That's way too dependent on context to say the cost is always worth the complexity.

On a team that is experienced in react, or a project that is heavily dependent on client side rendering react (or similar) make sense.

On a team that is more backend focused or a project that is CRUD heavy and generally rendering state that persists on the server, it could very well make sense to lean on server rendered HTML with small bits of JS scripts for interactivity.

We as an industry way over tilted on client-side rendering. If you're building Facebook or Figma or Discord, sure maybe CSR is a must. For most websites you don't need much CSR though, and if you're only using it for small bits of interactivity you may be better offer foregoing the complexity of a framework and taking responsibility for the full render pipeline.