Because of https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/Console/Application.php#L67 isn't final it can be extended.
It would be great to have an access to the $dispatcher property in child class.
Now we need to override setDispatcher() method to have an access to the dispatcher.
Also it would be great if you patched another versions too. At least 5.1 and greater.