Laravel not working with PHP Built-in Server

I want to setup a PHP project with IntelliJ 2019.2 Ultimate and downloaded a clean Laravel 5.8 project. I also created a Run Configuration in IntelliJ using the "PHP Built-in Web Server". When I run that, the server starts without any error messages. The server responds with "404 Not Found The requested resource / was not found on this server." though when I hit http://localhost/ in my browser.

In routes/web.php I defined a route for / though:

<?php

Route::get('/', function () {
    return view('welcome');
});

Why isn't the welcome view isn't returned here? When I create a index.php though, it is getting returned from the server.

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