Some of these I just don't understand. Urdu has been mentioned, but the Philippines is more than 100 million people too. Granted some of those will be Cebuano, but Tagalog (Filipino) is the official language.
Why not just expand all of Microsoft 365 to support those rather than regressively remove them from iOS Outlook? It's not like there's a shortage of available people in different countries willing to do translation work.