I can see that the present API (v.2.2) does not return the contents of "About me" field in the /users endpoint.
It would be nice to at least read-only expose the field. However as a software engineer, you have to understand that each feature must be balanced against the costs and risks.
- How many users (and user apps) will programmatically access
- How long does it take to add a field into the API?
- Are there security risks by exposing the field for write access?
It would be much better if your post contained guesstimate answers to the above questions to coherently argue for this feature to be implemented.