I fail to see the difference. 5xx still returns content. 5xx can return HTML content. Browser will display it properly. 4xx codes mean client error. 5xx codes

I fail to see the difference. 5xx still returns content. 5xx can return HTML content. Browser will display it properly. 4xx codes mean client error. 5xx codes mean server error. Server misconfiguration is a server error. Client did nothing wrong.