By moving to a fully decoupled approach you are losing the benefits of integrating with future third-party WordPress plugins that work with a React-based front end as well as not being able to avoid additional network requests on app initial load.
I suppose it depends on the goals of the project. Some folks would rather only use WordPress at the data source and not require any functionality from plugins (unless those plugins manipulate the data, but in that case you still wouldn't care that it's fully decoupled, because those plugins could still interact with the data within WP and never care about the frontend).
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By moving to a fully decoupled approach you are losing the benefits of integrating with future third-party WordPress plugins that work with a React-based front end as well as not being able to avoid additional network requests on app initial load.
I suppose it depends on the goals of the project. Some folks would rather only use WordPress at the data source and not require any functionality from plugins (unless those plugins manipulate the data, but in that case you still wouldn't care that it's fully decoupled, because those plugins could still interact with the data within WP and never care about the frontend).