Re: Did Prophet Mohammad want to convey a message before he died
well as far as teaching arabic to arabs, and the prophet not being completely illiterate being a new idea, at least one major sect (shias) believe that the Prophet could read and write, and their origin is quite early in Islam in arabia, and the principal sources of religious dogma for that sect were arabic speaking.
i dont know about various sunni sects but going by what ive learnt about sunni Islam, what is presently the prevailing view may not always have been the universal "sunni" belief.
so its not really just a matter of revisionism, and much more related to whom you look to for historical knowledge.