This is an issue that I found out while discussing with a prospect at LibrePlanet, who needs to be able to type in Korean. I presumed that PureOS, like Ubuntu and Debian, would have language packs and special input methods easily installable (if not already installed by default) but that was not the case. I had to use my Fedora machine to demonstrate the feature working, as I was unable to find any *ko packages (through gnome-software or apt-cache search or apt-get install attempts) that would enable this.
Disk space is cheap these days (especially for OEM preloads), so PureOS should just bundle all locales and input methods by default if the packages themselves are not multi-gigabytes.