Great video as always, as someone with imposter syndrome I can't bring myself to actually add something to the Laravel source code but you could add the following to src/Illuminate/Mail/Mailer.php to get the same as queue: (This is a very quick prototype)

    /**
     * Defers Sending a new message using a view.
     *
     * @param $view
     * @param array $data
     * @param $callback
     * @return void
     */
    public function defer($view, array $data = [], $callback = null)
    {
        // Defers the sending of email to after the view is rendered,
        defer(function () use ($view, $data, $callback) {
            return $this->send($view, $data, $callback);
        });
    }

Execute Code After a Response is Returned?