Well. No they were not pretty advanced. Their empires were. Precisely because until the 12th century and Timur e Langs genocide of Assyrian Christians, near genocide of Georgians and Armenians and Zoroastrians and Buddhists and Hindus there were majority non Moslem. As the % of Moslems increased, society’s culture decreased. Example the birthplace of Islam, the Arabian peninsula was a sh t hole already by the 9th century with Christians and Jews kicked out of this “pure” land
Well put.