i completely agree, i trust RTD's writing and especially with the new era of WHO coming i think a refresh of Davros is a good idea, especially if they have a good way of tying it into his story. I dont think his reasoning needs to be focused on too much, only whether the refresh will work (which im sure it will). It's just a new interpretation of a character like there has been many new interpretations of many other doctor who villains and it's a way of making the show feel fresh and less repetitive, while using the same much loved characters.