Why redux-thunk instead of store.dispatch/store.getState()

Question

I've always used redux-thunk or some sort of middleware that grants me access to dispatch/getState, but I have a question that keeps bugging me. Why using that when we can import our store and call store.dispatch()/store.getState().

Later edit:

As a quick example, here's the original code:

function loadData(userId) {
  return dispatch => fetch(`http://data.com/${userId}`) // Redux Thunk handles these
    .then(res => res.json())
    .then(
      data => dispatch({ type: 'LOAD_DATA_SUCCESS', data }),
      err => dispatch({ type: 'LOAD_DATA_FAILURE', err })
    );
}

Basically, what I'm asking is why is it bad to rewrite this as:

import store from 'our-store';

function loadData(userId) {
  return fetch(`http://data.com/${userId}`)
    .then(res => res.json())
    .then(
      data => store.dispatch({ type: 'LOAD_DATA_SUCCESS', data }),
      err => store.dispatch({ type: 'LOAD_DATA_FAILURE', err })
    );
}