Sek
It's just necessary to read the original Koran, which is virtuous but not necessary.
You also have to understand that most of the world at the time of Muhammad didn't have a written language, so learning to write and speak Arabic was considered a form of enlightenment and actually improved societies.
Speaking or reading Arabic isn't necessary to properly practice Islam.Or doesn't read or speak arabic!
It's just necessary to read the original Koran, which is virtuous but not necessary.
You also have to understand that most of the world at the time of Muhammad didn't have a written language, so learning to write and speak Arabic was considered a form of enlightenment and actually improved societies.