Keep the engine that already handles your carts, orders, and tax. Replace the front end it ships with. Done for the right reasons it removes every design and performance ceiling — done for the wrong ones it just adds a codebase.
Headless isn't one product you buy. It's six decisions that have to agree with each other — which is why it goes wrong when it's assembled by whoever is free.
A framework front end — Next, Astro, or Hydrogen — rendered at the edge, with the design freedom a theme system can't give you.
Your existing engine stays. Shopify, commercetools, BigCommerce, or a custom backend keeps carts, orders, and pricing exactly where they are.
A CMS your marketing team can publish from without a deploy, modelled around campaigns and landing pages rather than product records.
A real search index with synonyms, ranking rules, and faceting — the part of headless that most often pays for the whole project.
Caching and revalidation strategy per route, so a catalogue of 50,000 SKUs stays fast without rebuilding the site on every price change.
One storefront serving several locales, currencies, and brands — instead of a separate store to maintain for each one.
Headless adds a codebase, a deploy pipeline, and a CMS to look after. Without someone owning the front end, it becomes the thing nobody can change.
If the constraint is design polish rather than an actual platform limit, a custom theme costs a fraction and ships months sooner.
A decoupled build front-loads the work. If the deadline is the fixed constraint, staying on the platform's front end is the honest answer.
If any of those sound like you, the better-value conversation is usually a custom theme — Shopify development.
Decoupling costs you simplicity. These are the four things worth paying that price for — and if none of them is your problem, it isn't worth it.
Tell us what the platform is stopping you doing. We'll tell you whether decoupling actually fixes it, what it costs to run afterwards, and what the cheaper answer would be.