Comment #11 on pull request 1213 by kimgr: RFC: Improved suggestions for namespace use
https://github.com/include-what-you-use/include-what-you-use/pull/1213
@headhunter45 Yes, exactly. Otherwise it's hard to know when to stop - if you have an unused static function in your file that uses `std::string`, do we remove that? Etc.
IWYU's focus is the relationship between symbols and files, and I think it's nice to stay within those fences.
That said, it would be cool to see some clang-tidy checks to do e.g. unused `using` cleanup. Then IWYU would be free to remove the leftover headers.