§ 01When a classic website wins
A classic multi-page or static site is usually better for services, landing pages, blogs, documentation and SEO-driven content. It loads predictably, is easier to index and is cheaper to maintain.
Frameworks such as Astro or Next.js can still provide modern components without forcing the whole product into client-side rendering.
§ 02When a SPA is justified
A SPA is justified for dashboards, CRMs, editors, SaaS products and tools where users stay inside the interface and perform many actions without full page reloads.
The cost is higher because routing, state, authentication, data loading and error states become part of the product architecture.
§ 03SEO and performance
Client-side rendering can be indexed, but it adds risk. If organic traffic matters, render important content on the server or at build time.
Measure LCP, CLS and INP before and after launch. Architecture choices should be validated by field data, not by preference.
§ 04A practical rule
If the main value is content, choose a website. If the main value is repeated interaction with private data, choose an app. If you need both, split marketing pages and app area into separate surfaces.
This keeps SEO clean and product code maintainable.
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