It is important to emphasize personal voice because as an artist, you constantly are trying to find your voice and a way to express yourself that is unique to you. Your personal voice helps set you apart from other artists and find your particular style/technique so I do think it is important for there to be an emphasis on this.
I believe that it is necessary for art and art history to be combined and most of the time they already do interact with each other and the classes are in the same building. Art education is also important and should be incorporated with art and art history if students are interested in art education. I do not believe that it is important for those students who are not interested in the education field to be required to take art education classes. However, if they did, it might be a benefit and they might better understand what teaching styles their professors use and other ways they could be of assistance to peers struggling with projects. But I do believe that art educators should be involved with art and art history educators so they are all on the same page and are able to work and gain ideas from one another because as artists that what we do.