I recently encountered the limitation of the Infoplus API that it doesn't support Unicode. The troubleshooting article states this is because the backend database doesn't support it, which makes me curious what kind of database is being used, here. All the database software I'm aware of has supported various Unicode encodings for at least a decade. Even JSON already requires UTF-8.
This is a major issue in the API and underlying software. Without Unicode, we can't properly support international shipments, especially since large portions of the globe speak languages other than English, and thereby use characters not in the ASCII set. (Simply dropping unsupported characters in even worse, by the way. There's a big difference between a piñata and a piata, for example.)
In any case, proper Unicode support is essential for international shipping, and in today's world, international is a must.