There are many use cases to use getAccessTokenSilently outside of a component (for example, in an Axios Interceptor or an Apollo Client).
It's tempting to ask for the option to pass an Auth0Client instance into the Auth0Provider so that its getTokenSilently method can used outside of the context of a component, eg.
const client = new Auth0Client();
export const getAccessToken = () => client.getTokenSilently();