The frontend and the commerce backend are separate systems talking over an API — not one monolithic app. That split is what makes near-instant page loads possible, and it's overkill for most stores just starting out.
You have real, sustained traffic where load-time improvements translate directly into revenue, or you're planning to serve the same product data to a website, an app, and other channels from one backend.
If speed at high traffic is the actual bottleneck — not a nice-to-have — this is the option built for that specific problem.
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