Re: Words will be said
Well, 2% of India's massive phone market can be quite a few devices. Not quite 55 million, but still a large chunk. Several countries whose languages are supported aren't that big. I don't see Danish (population of Denmark 5.81 million), Czech (population of Czechia 10.7 million), or Greek (population of Greece plus population of Cyprus 12.04 million) being removed from the supported lists, even though by most potential arguments those make more sense. Not all of those people use Outlook on IOS either, and in all four of those countries, a large section of the population is likely to speak another language, primarily German or English, which would remain supported.
Speakers of the removed languages may also speak English, Hindi, Spanish, or Russian but not necessarily. Certain other languages, such as Tagalog, are not associated with multilingualism with a supported language; while English and Spanish are spoken in the Philippines, the lingua franca in many areas is Tagalog, with people being bilingual in that and their native tongue.