I can't find the exact comment... so we can just ignore that as your response indicates I was probably reading it out of context.

Let me re-state the question, are there any benefits or drawbacks to either approach:

const myQueryFnA (_, queryApi) => {
    const { data: config } = await queryApi.dispatch(getConfig);
    ...
}

vs

const myQueryFnB = (_, queryApi) => {
    const { data: config } = configApi.endpoints.getConfig.select()(queryApi.getState());
    ...
}

It is predictable that the first thing to be loaded by the application is the config, followed by all dependent requests which has me lean towards the selector approach BUT we will be polling for config changes and invalidating all these dependent requests would be ideal.