Why develop user documentation on the part of the developer?

Question

Documentation

What can user documentation give a developer besides unloading those. support?

Answer 1

1. This is an additional source of truth - how the program should work.
This means less disputes about what is a bug and what is a feature, and why something was done this way and not otherwise.
2. This will make onboarding new team members easier - instead of spending a lot of time talking about the product verbally, you can simply show the instructions.