Based on the Javadoc of Processor

The Filer interface discusses restrictions on how processors can operate on files.

Therefore, I presume other forms of file manipulation, such as with Files are not a good practice. My question is why in Filer it was decided not to allow overwriting files that are generated with annotation processors? What are the pros and cons? I understand that overwriting the source code or other critical objects may pose security risks, but what about those generated by processors?