WordPress is pretty good until you start adding loads of content because it's built-in API is REST. You can get a lot more out of a plugin which adds a GraphQL layer to WordPress, but I have experienced issues with that before because GraphQL is strict on types whereas WordPress (based on PHP) is dynamic, so if there's a type mismatch (say for example someone has a number as a slug, where elsewhere it's a string) the GraphQL layer can break unexpectedly.