For things like docker simply parsing the help isn't enough. Docker's environment can get pretty complex, pretty quick. There are a thousand different arguments

For things like docker simply parsing the help isn't enough. Docker's environment can get pretty complex, pretty quick. There are a thousand different arguments that require different kinds of inputs (think ports, mounts, images id, container I'd and much more). You cannot figure out what the argument type is from just the help or manpages. This is the case for many, many applications.