Function IIFE

Quisiera saber el motivo por el cuál se quito la función IIFE del archivo script.js, si esto se deba a que podría provocar un error o algo. Con función IIFE:

(()=> {
import checkComplete from "./components/checkComplete.js";
import deleteIcon from "./components/deleteIcon.js";

const btn = document.querySelector("[data-form-btn]");
const input = document.querySelector('[data-form-input]'); 
const list = document.querySelector('[data-list]');
const noTask = document.querySelector('.noTask');

const createTask = (evento) => {
    evento.preventDefault();
    const text = input.value;

    if(text !== ""){
        const task = document.createElement('li');
    task.classList.add('card');

    const taskContent = document.createElement('div');
    const titleTask = document.createElement('span');
    titleTask.classList.add('task');
    titleTask.textContent = text;

    taskContent.appendChild(checkComplete());
    taskContent.appendChild(titleTask);
    task.appendChild(taskContent);
    task.appendChild(deleteIcon());
    list.appendChild(task);
    input.value = '';
    noTask.style.display = 'none';
    }
}

btn.addEventListener("click", createTask );

})();

Sin función IIFE

import checkComplete from "./components/checkComplete.js";
import deleteIcon from "./components/deleteIcon.js";

const btn = document.querySelector("[data-form-btn]");
const input = document.querySelector('[data-form-input]'); 
const list = document.querySelector('[data-list]');
const noTask = document.querySelector('.noTask');

const createTask = (evento) => {
    evento.preventDefault();
    const text = input.value;

    if(text !== ""){
        const task = document.createElement('li');
    task.classList.add('card');

    const taskContent = document.createElement('div');
    const titleTask = document.createElement('span');
    titleTask.classList.add('task');
    titleTask.textContent = text;

    taskContent.appendChild(checkComplete());
    taskContent.appendChild(titleTask);
    task.appendChild(taskContent);
    task.appendChild(deleteIcon());
    list.appendChild(task);
    input.value = '';
    noTask.style.display = 'none';
    }
}

btn.addEventListener("click", createTask );