But the idea that there should not even be proper documentation is absolutely ludicrous. You might as well run the project as closed source then.
The control of the code is codified through the SSH access keys. In the end the references to "community" are very vague and not based on formal trust models. I assume that miners largely don't care.
This is not a choice made, this is a result of what the meaning of trust is. The openest source project is one which the code is the only documentation for the reasons already provided. This is because any other interpretation is by definition not necessarily trustworthy. Descriptions are free to exist, but none have special status as "correct" except the source code.
Bitcoin is a big "company" of people who have no mutual trust. I've got no reason to trust your description over the actual source code, which is why others here see this as moot.