Would PHPLint's advice be beneficial to our community?
In theory, there sure are benefits. There are however some issues with doing it, as you partially found out yourself already.


There will be like a million false warnings, might just be as hard to find the real issues as when simply reading the code.
Drupal has a quite a few custom coding standards. For example, we're currently not using type declarations in docblocks except for @return $class.


I don't know how configurable PHPLint is, maybe there are a few checks that would make sense to run on our code.

For coding style issues, it might make more sense to use http://drupal.org/project/drupalcs