So there isn't a single package in Arch Linux which trusted users have changed them in order to fix an issue which they thought it's better this way?

If there is/was a package what is/was it and why?

Arch Linux defines simplicity as without unnecessary additions or modifications. It ships software as released by the original developers (upstream) with minimal distribution-specific (downstream) changes: patches not accepted by upstream are avoided, and Arch's downstream patches consist almost entirely of backported bug fixes that are obsoleted by the project's next release. [1] [1] https://wiki.archlinux.org/index.php/Arch_Linux