I disagree with this notion completely. Caste matters a lot in Pakistan, especially when you need to get something done at a government office. A lot of ‘untouchables’ who converted to Islam still are known as ‘chuhras’ which literally means untouchable. For more information, you can read ‘The Unconquered People: The Liberation of an Oppressed Caste’ by John O Brien. If you go beyond the PakNationalist view of history, Sir Syed was a caste chauvinist, Ali Garh School and later college were reserved for Higher caste Muslims. Religious leaders like Ahmad Raza Khan Barelvi, Qasim Nonotwi (founder of Deoband), Mufti Shafi Osmani, Hussain Ahmad Madni were also against teaching ‘lower-caste’ muslims.