>LLMs can turn plain English into a software tool in the matter of minutes.

Unless LLMs can read minds, no one will bother to specify, even in plain english with the required level of detail. And that is assuming the user has the details in mind, which is also something pretty improbable...

You need to think outside the box a little. They're not going to need to write a requirements doc from scratch. They'll tell it to copy a piece of software which is already established and make some customisations or improvements based on their needs. This is a few sentences.