A sophisticated GraphQL client implementation, such as Apollo Client, can help developers construct correctly formed requests, keep their UI components consistent across queries, and provide flexible ways to update the cache with results from the server when using mutations, pagination, subscriptions, and more. By leveraging the structure of GraphQL, these libraries enable developers to implement these properties, making development experiences more pleasant. However, it's essential to separate reality from misconceptions about GraphQL clients' roles, as their primary goals are not solely focused on improving performance or ensuring client-server consistency, but rather on facilitating the execution of GraphQL queries and maintaining UI consistency.