Probably because changing stuff in the main OS is pretty complex and needs approval from many different actors at Microsoft.
Releasing a simple utility application on the other hand should be much easier and isn't bound to any release cycle.
Yeah, is it localized to eleven fallback languages, and accessible to blind people, and included in the security threat model? Including anything in Windows costs serious money, so for some niche features you might need to install an out of band, less supported package.
