In a funeral why does the kaddish not mention about the dead person?

Prayers come standard, but there is time before the burial for the family and friends to recite their speeches.
" Future ages will wonder at us, as the present age wonders at us now. We do not need the praises of a Homer, or of anyone else whose words may delight us for the moment, but whose estimation of facts will fall short of what is really true. For our adventurous spirit has forced an entry into every sea and into every land; and everywhere we have left behind us everlasting memorials of good done to our friends or suffering inflicted on our enemies. "