> A Wayland environment can not select a modern date format because the Wayland project did not untangle the way glibc defines the date format and therefore it is not possible to negotiate a date format over the wayland protocol, just a glibc locale. And there is no point in redefining things at another level than wayland because users expect their dates to look the same in all apps.

Why duplicate this in Wayland, instead of fixing glibc to provide something sufficient?

By that measure, is Wayland insufficient because it doesn't provide a universal file-access API, or network access mediation to enforce parental controls?